Socket AM2 Design Specification

Socket AM2
Design Specification
Publication # 31875 Revision: 3.00
Issue Date:
May 2008
Advanced Micro Devices
© 2004–2008 Advanced Micro Devices, Inc. All
rights reserved.
The contents of this document are provided in connection with Advanced
Micro Devices, Inc. (“AMD”) products. AMD makes no representations or
warranties with respect to the accuracy or completeness of the contents of this
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product descriptions at any time without notice. The information contained
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respective companies.
31875 Rev. 3.00
May 2008
Socket AM2 Design Specification
Contents
Revision History ...............................................................................................................................6
Chapter 1
Introduction..............................................................................................................7
1.1
Purpose...............................................................................................................................7
1.2
Supplier Requirements.......................................................................................................7
Chapter 2
Microprocessor Package Description.....................................................................9
Chapter 3
Socket Mechanical Requirements ........................................................................11
3.1
Socket Outline..................................................................................................................11
3.2
Package Seating Plane .....................................................................................................12
3.2.1
Package Supports and Seating Plane Dimensional Requirements...........................12
3.2.2
Measurement Method for Package Supports and Seating Plane .............................12
3.3
3.3.1
3.4
Socket Base and Socket Cover ........................................................................................15
Socket Markings ......................................................................................................16
Socket Contact .................................................................................................................16
3.4.1
Contact Base Metal ..................................................................................................16
3.4.2
Contact Plating.........................................................................................................16
3.4.3
SMT Solder Balls.....................................................................................................17
3.5
Socket Actuation Lever ...................................................................................................17
3.5.1
Lever Material..........................................................................................................17
3.5.2
Package Insertion and Extraction Force ..................................................................17
3.5.3
Socket Retention Force ............................................................................................17
3.5.4
Locking Latch ..........................................................................................................17
3.5.5
Lever Actuation and Deactuation Force ..................................................................18
3.5.6
Pin Field Actuation Displacement ...........................................................................18
3.6
Socket Durability .............................................................................................................18
3.7
Visual Inspection .............................................................................................................18
3.7.1
Solder Balls..............................................................................................................18
3.7.2
Contacts....................................................................................................................18
3.7.3
Cover and Base ........................................................................................................18
3.7.4
Actuation Lever .......................................................................................................18
Contents
3
31875 Rev. 3.00
Socket AM2 Design Specification
Chapter 4
Socket Electrical Requirements ........................................................................... 19
4.1
Contact Current Rating.................................................................................................... 19
4.2
Low Level Circuit Resistance (LLCR) ........................................................................... 19
4.2.1
Initial Resistance ..................................................................................................... 19
4.2.2
Final Resistance....................................................................................................... 19
4.3
Inductance ....................................................................................................................... 20
4.4
Capacitance ..................................................................................................................... 20
4.5
Differential Impedance.................................................................................................... 20
4.6
Propagation Delay ........................................................................................................... 20
4.7
Crosstalk.......................................................................................................................... 20
4.8
Dielectric Withstanding Voltage (DWV)........................................................................ 21
4.9
Insulation Resistance....................................................................................................... 21
Chapter 5
4
May 2008
Socket Environmental Requirements.................................................................. 23
5.1
Thermal Shock ................................................................................................................ 23
5.2
Cyclic Humidity .............................................................................................................. 23
5.3
Thermal Cycling.............................................................................................................. 23
5.4
Temperature Life............................................................................................................. 23
5.5
Industrial Mixed Flowing Gas......................................................................................... 23
5.6
Mechanical Shock ........................................................................................................... 24
5.7
Random Vibration ........................................................................................................... 24
5.8
Resistance to Solder Heat................................................................................................ 24
5.9
Resistance to Solvents..................................................................................................... 24
5.10
Heatsink Assembly.......................................................................................................... 24
Contents
31875 Rev. 3.00
May 2008
Socket AM2 Design Specification
List of Figures
Figure 1. A 3-D View of Socket AM2...............................................................................................7
Figure 2. 940-Pin Organic μPGA Package Drawing .........................................................................9
Figure 3. Socket AM2 Outline.........................................................................................................11
Figure 4. Illustration of Outer Region Measurement Points............................................................13
Figure 5. Definition of Step Height .................................................................................................13
Figure 6. Illustration of Best-Fit Plane and Outer Support Region Flatness ...................................14
Figure 7. Illustration of Inner Support Measurement Method.........................................................14
Figure 8. Illustration of Inner Support Measurement Locations......................................................15
List of Figures
5
31875 Rev. 3.00
Socket AM2 Design Specification
Revision History
Date
May 2008
6
Revision
3.00
Description
Initial Public release.
Revision History
May 2008
31875 Rev. 3.00
May 2008
Chapter 1
Socket AM2 Design Specification
Introduction
This design specification defines the requirements for a 940-pin, 1.27-mm pitch, surface mount
technology (SMT), zero insertion force (ZIF) socket (herein referred to as Socket AM2) for use
with Advanced Micro Devices (AMD) 940-pin, organic, micro pin grid array (μPGA) package.
Socket AM2, shown in Figure 1, is designed to provide a reliable electrical interconnect between
the printed circuit board (PCB) and the 940 pins of the organic µPGA package, throughout the life
of the product.
Figure 1. A 3-D View of Socket AM2
1.1
Purpose
This document specifies the dimensional, electrical, mechanical, and reliability requirements for
the Socket AM2 that are necessary to meet the performance requirements of AMD microprocessor
products.
1.2
Supplier Requirements
To become an AMD qualified supplier for Socket AM2, the potential socket supplier must
demonstrate that their product meets the requirements listed in this document and must conduct
qualification testing on their production run sockets in accordance with the Socket AM2
Qualification Plan, order# 32889.
Chapter 1
Introduction
7
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Socket AM2 Design Specification
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Introduction
May 2008
Chapter 1
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Chapter 2
Socket AM2 Design Specification
Microprocessor Package
Description
Figure 2 shows the substrate and pin dimensions, tolerances, and true position parameters of the
940-pin organic µPGA package that mates with the Socket AM2.
Socket AM2 is designed to be functional with the lidded, as well as with the lidless, package
configuration.
Figure 2. 940-Pin Organic μPGA Package Drawing
Chapter 2
Microprocessor Package Description
9
Socket AM2 Design Specification
10
Microprocessor Package Description
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Chapter 2
31875 Rev. 3.00
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Chapter 3
Socket AM2 Design Specification
Socket Mechanical Requirements
This chapter describes the socket outline and mechanical requirements for the Socket AM2.
3.1
Socket Outline
Figure 3 shows the maximum allowable outline for the Socket AM2. All dimensions are shown in
millimeters.
Figure 3. Socket AM2 Outline
Chapter 3
Socket Mechanical Requirements
11
Socket AM2 Design Specification
3.2
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Package Seating Plane
The cover for the Socket AM2 is designed to accommodate the package pin shoulder and
braze/solder fillet as shown by the 940-pin organic µPGA package drawings in Figure 2, on
page 9. Package support structures are incorporated into the socket cover to provide sufficient
mechanical support (seating plane) for the package substrate without causing damage to the
package pins at any time.
The package-seating plane on the socket cover has a surface flatness of 0.25 mm or smoother
when unmated, as well as when mated, with a package. After the socket is mounted to the PCB,
the package-seating plane on the socket cover is 4.00 ± 0.20 mm from the mounting surface of the
PCB.
3.2.1
Package Supports and Seating Plane Dimensional Requirements
To ensure proper support of the processor package while it is situated in the socket, the outer
region of the socket seating plane that supports the outer portion of the processor package and the
inner package supports (indicated in Figure 3, on page 11) must meet the following dimensional
requirements:
1. The outer support region step height is 0.30 ± 0.05 mm.
2. The flatness of the outer support region must not exceed 0.25 mm.
3. The inner supports is + 0.03 ± 0.06 mm above the least mean squares defined plane of the
outer support region.
Refer to measurement requirements in Section 3.2.2.
3.2.2
Measurement Method for Package Supports and Seating Plane
The features in Section 3.2.1 must be measured using the following methodology:
Measurement Conditions
1. The socket to be measured must be reflowed to a PCB using the recommended reflow process
for the socket for the particular solder ball composition.
2. A fixture that maintains the cover plate in contact with the base plate at the inner seating plane
supports must be used for this measurement.
Outer Support Region Step Height Measurement
1. Measure the outer step height at 24 evenly-spaced points (6 per side) around the outer support
using a local point-to-point method. Refer to Figure 4, on page 13.
2. The step height is the difference in height between a point on the outer support region and an
adjacent point on the recessed plane of the socket. See Figure 5, on page 13, for the
measurement area of the step height.
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Socket Mechanical Requirements
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31875 Rev. 3.00
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Socket AM2 Design Specification
3. Acceptance criteria: Step height conforms to dimensional requirement in Section 3.2.1, item 1,
on page 12.
7
13
1
24
19
Figure 4. Illustration of Outer Region Measurement Points
Figure 5 shows the measurement area of the step height.
Substrate
Support
Step Height
Recessed
Plane
Figure 5. Definition of Step Height
Chapter 3
Socket Mechanical Requirements
13
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Socket AM2 Design Specification
May 2008
Outer Support Region Flatness Measurement
1. Determine the best-fit plane the LMS (least mean squares) method to the 24 points measured
on outer support region used in the step height measurement.
2. Calculate the normal distance from each point to the LMS plane.
Outer support region flatness = [Maximum normal distance of all points above the LMS plane]
–[Maximum normal distance of all points beneath the LMS plane (which is a negative
number)]. Refer to Figure 6.
3. Acceptance criteria: Outer support region flatness meets criteria in Section 3.2.1, item 2, on
page 12.
Best-Fit LMS Plane
Figure 6. Illustration of Best-Fit Plane and Outer Support Region Flatness
Inner Support Region Measurement
1. Using the outer support region LMS plane defined in the previous subsection, measure the
distance between four support posts and the defined plane using a point-to-plane method.
Refer to Figure 7 for an illustration of the measurement method and Figure 8, on page 15, for
an illustration of the measurement locations.
2. Acceptance criteria for all four support posts measured must meet the dimension requirement
of Section 3.2.1, item 3, on page 12.
Best-Fit LMS
Plane
Inner
Support
0.03±0.06 (Point-to-Plane)
Outer
Support
Outer
Support
Figure 7. Illustration of Inner Support Measurement Method
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Socket Mechanical Requirements
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Socket AM2 Design Specification
26
27
28
25
Figure 8. Illustration of Inner Support Measurement Locations
3.3
Socket Base and Socket Cover
The socket base and socket cover are made from liquid crystal polymer (LCP) with a UL
flammability rating of 94 V-0. The colors for the socket base and cover are as follows:
•
•
Socket base color — black
Socket cover color — natural or ivory
The thickness of the socket cover (including the 0.30-mm pocket recess) must not exceed
1.17 mm. The socket cover flatness is less than 0.25 mm before and after the SMT reflow to the
PCB. The flatness measurement must remain less than 0.25 mm after environmental and
mechanical testing.
Either a removable tape or plastic cover acts as an overlay for the pinholes in the top of the socket
cover. The overlay facilitates socket pick-and-place operation with a vacuum nozzle during board
assembly. The overlay must not outgas during the solder reflow processes or leave any residue
upon removal prior to package pins insertion.
Chapter 3
Socket Mechanical Requirements
15
Socket AM2 Design Specification
3.3.1
31875 Rev. 3.00
May 2008
Socket Markings
The requirements for socket markings are as follows:
•
•
•
•
•
The socket identifier marking “SOCKET AM2” must be molded into the top surface of the
socket cover cam box region. See Figure 1 on page 7.
A locked and unlocked directional designator is molded into the top surface of the cam box in
close proximity to the actuation lever. See Figure 1 on page 7.
A triangular shape symbol must be molded into the top of the socket cover for proper package
pin A01 orientation. This orientation symbol is located to remain visible after the package is
mated to the socket as shown in Figure 1 on page 7 and Figure 3 on page 11.
The supplier’s UL approved symbol must be molded on the socket cover. This marking is
located such that it remains visible and readable after the socket is solder mounted onto the
PCB.
The lot traceability number can be ink, laser, or impact marked on the socket cover. This
marking must be located to be visible and readable after the socket is solder mounted onto the
PCB.
3.4
Socket Contact
This section describes the contact material and solder balls for socket attachment to the PCB.
Note: No lubricants can be present on the contact mating areas of fully assembled sockets that
are shipped to customers by the supplier.
3.4.1
Contact Base Metal
The contact base metal is high-strength copper alloy.
3.4.2
Contact Plating
The specifications for the contact plating are as follows:
•
•
16
Plate the entire contact with 1.27-μm minimum thickness of nickel.
Plate the contact mating area with 0.76-µm minimum thickness of gold over the 1.27 µm
minimum thickness of nickel underplating. Gold porosity in the contact mating areas must be
minimized, with no more than two pores with a diameter greater than 0.05 mm allowed per set
of 25 contacts examined.
Socket Mechanical Requirements
Chapter 3
31875 Rev. 3.00
3.4.3
May 2008
Socket AM2 Design Specification
SMT Solder Balls
The specifications for the SMT solder balls are as follows:
•
•
•
•
•
The socket is mounted to the PCB by SMT, with a PCB solder pad diameter of 0.64 mm.
The solder balls on the socket have a diameter of 0.76 ± 0.15 mm and are either leaded or
lead-free in composition.
• Leaded solder ball composition is tin/lead (63/37 ± 5%).
• Lead-free solder ball composition can be Sn4.0Ag0.5Cu(SAC405),
Sn3.0Ag0.5Cu(SAC305), or Sn3.5Ag.
The contact must include a solder barrier feature to prevent solder from wicking up into the
contact mating area during solder reflow.
The Socket AM2 solder ball field must meet the co-planarity requirement of 0.20 mm.
The force required to shear off the solder ball from the contact must be a minimum of 0.75 kgf.
3.5
Socket Actuation Lever
The socket incorporates a lever to the right side of the cam box for actuating and deactuating the
socket contacts with the package pins. This actuation lever provides the mechanical advantage to
easily actuate the socket in an OEM high-volume manufacturing environment and also facilitates
toolless socket actuation and deactuation operations by the end-user.
3.5.1
Lever Material
Stainless steel is the recommended material for the actuation lever.
3.5.2
Package Insertion and Extraction Force
With the actuation lever in the open position, the package insertion and extraction forces,
conceptually, are zero. These insertion and extraction forces must not exceed 2 kgf in actual
applications.
3.5.3
Socket Retention Force
With the actuation lever in the closed position, the force required to extract the package pins out of
the socket contacts must be a minimum of 0.013 kgf per pin.
3.5.4
Locking Latch
The socket cover incorporates a latch mechanism to lock the lever in the closed position after the
socket contacts are mated with the package pins. Support tab(s) are added to the socket cover to
cradle the actuation lever in the closed position. The tab(s) prevent the actuation lever from
contacting the PCB.
Chapter 3
Socket Mechanical Requirements
17
Socket AM2 Design Specification
3.5.5
31875 Rev. 3.00
May 2008
Lever Actuation and Deactuation Force
The force required to actuate or deactuate the lever must be less than 3.6 kgf.
3.5.6
Pin Field Actuation Displacement
The package pins must be displaced less than 1.0 mm during socket actuation or deactuation.
3.6
Socket Durability
The socket must maintain electrical and mechanical integrity after 50 actuation and deactuation
cycles with each mating package used no more than 5 mating cycles.
3.7
Visual Inspection
All visual inspections must be at 1X magnification, except for solder balls that must be inspected
at 5X magnification.
3.7.1
Solder Balls
No missing, malformed, damaged, or misaligned solder balls can be attached to the contacts.
3.7.2
Contacts
No missing or damaged contacts that prevent the socket from functioning properly are allowed.
Contact mating surface must not be missing gold plating.
3.7.3
Cover and Base
No cracks or flashing can be visible on the socket cover and base. All tabs that secure the socket
cover to the base must not be damaged or missing. The socket cover must fit properly on the
socket base with no visible gap between them. The lever latch cannot be damaged or malformed.
3.7.4
Actuation Lever
The actuation lever cannot be damaged, malformed, or missing.
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Socket Mechanical Requirements
Chapter 3
31875 Rev. 3.00
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Chapter 4
Socket AM2 Design Specification
Socket Electrical Requirements
This chapter describes the contact current rating, inductance, capacitance, differential impedance,
propagation delay, crosstalk, dielectric withstanding voltage, and insulation resistance of the
Socket AM2.
4.1
Contact Current Rating
The contact must be rated at a current rating of 1.5-Amp per contact with less than 30 °C
temperature rise and with a minimum of ten rows of mated contacts and pins energized.
4.2
Low Level Circuit Resistance (LLCR)
Contact resistance applies to the mounted socket with actuated package pin and includes the bulk
resistance of the contact, solder ball, package pin, and the interface resistance between the contact
and the package pin, but does not include the package internal trace resistance.
4.2.1
Initial Resistance
Initial contact resistance must be measured immediately after the first mating of the package pins
to the socket contacts. The 200 daisy-chained pairs (400 contact locations) must be measured per
socket sample. Initial LLCR must not exceed 20 mΩ per contact when mated with Cu Alloy-194
pins, based on measurements made on a daisy-chained pair of contacts.
4.2.2
Final Resistance
Final contact resistance must be measured after completing the mechanical and environmental
testing of the mated package and socket. The same 200 daisy-chained pairs (400 contact
locations) must be measured per socket sample. Final LLCR must not exceed 20 mΩ per contact
when mated with Cu Alloy-194 pins, based on measurements made on a daisy-chained pair of
contacts.
Chapter 4
Socket Electrical Requirements
19
Socket AM2 Design Specification
4.3
31875 Rev. 3.00
May 2008
Inductance
The inductance specifications for the Socket AM2 are as follows:
•
•
•
The mated, partial self-inductance of a single pin must be less than 4 nH.
The mated-loop inductance of two nearest pins must be less than 3.3 nH.
The mated partial-loop inductance matrix of three neighboring pins must be less than 3.3 nH
for the diagonal entries, and must be less than 2.2 nH for the off-diagonal entries.
Note: Measurements are made at frequencies of 500 MHz and 2 GHz.
4.4
Capacitance
The capacitance specifications for the Socket AM2 are as follows:
•
•
The mated capacitance between two nearest pins must be less than 1 pF.
The mated capacitance matrix of three neighboring pins must be less than 1 pF.
Note: Measurements are made at frequencies of 500 MHz and 2 GHz.
4.5
Differential Impedance
The differential (or odd mode) impedance for three, mated-pins configuration (one pin as the
voltage/current reference—S1, S2, and G) must be 100 Ω ± 10% between the two nearest pins
(with an additional ± 2-Ω measurement error). If the Time Domain Method is used, the signal
must have a rise time of 150 ps for the signal amplitude to go from 10% to 90%.
4.6
Propagation Delay
The propagation delay specifications for the Socket AM2 are as follows:
•
•
The propagation delay skew among single-ended signals must be less than 10 ps, plus a
maximum measurement error of 3 ps.
The propagation delay skew among differential signal pairs must be less than 10 ps, plus a
maximum measurement error of 3 ps.
4.7
Crosstalk
Crosstalk between the nearest single-ended and differential signals must be measured and
compared to results from the measured partial-loop inductance and the Maxwell capacitance
matrices.
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Socket Electrical Requirements
Chapter 4
31875 Rev. 3.00
4.8
May 2008
Socket AM2 Design Specification
Dielectric Withstanding Voltage (DWV)
The contact-to-contact dielectric withstanding voltage between randomly selected adjacent lateral,
diagonal, and vertical contacts must be a minimum of 650 Vac.
4.9
Insulation Resistance
The contact-to-contact insulation resistance between randomly selected adjacent lateral, diagonal,
and vertical contacts must be a minimum of 1000 MΩ.
Chapter 4
Socket Electrical Requirements
21
Socket AM2 Design Specification
22
Socket Electrical Requirements
31875 Rev. 3.00
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Chapter 4
31875 Rev. 3.00
May 2008
Chapter 5
Socket AM2 Design Specification
Socket Environmental
Requirements
This section describes the socket design required to meet reliability requirements for the end-user
field-use environment, OEM high volume manufacturing environment, and shipping and handling
conditions of desktop computers.
5.1
Thermal Shock
Sockets must meet LLCR and visual inspection requirements after being subjected to 10 thermal
shock cycles with the cold temperature extreme at –55°C and the hot temperature extreme at
+110°C. The dwell at each temperature extreme is 30 minutes with less than 15 seconds transition
time. The test should be conducted with the associated heatsink assembly (AMD part number
TBD) attached to the processor package.
5.2
Cyclic Humidity
Sockets must meet LLCR, DWV, IR, and visual inspection requirements after being subjected to
1000 hours of cyclic humidity tests with a cycle time of 8 hours. Temperature range is 25°C to
85°C with relative humidity maintained between 90 to 95%. This test should be conducted with
the associated heatsink assembly (AMD part number TBD) attached to the processor package.
5.3
Thermal Cycling
Sockets must meet LLCR and visual inspection requirements after being subjected to a minimum
of 1000 cycles of thermal cycles with testing continued until 60% of the sockets failed or 3000
cycles are completed. Cold temperature extreme is –55°C with a dwell time of 20 minutes, and
hot temperature extreme is +110°C with a dwell time of 15 minutes. The average rate of
temperature change between the hot and cold temperature extremes must not exceed 10°C per
minute. This test should be conducted with the associated heatsink assembly (AMD part number
TBD) attached to the processor package.
5.4
Temperature Life
Sockets must meet LLCR and visual inspection requirements after being subjected to 500 hours of
temperature life testing at 115°C. This test should be conducted with the associated heatsink
assembly (AMD part number TBD) attached to the processor package.
5.5
Industrial Mixed Flowing Gas
Sockets must meet LLCR and visual inspection requirements after being subjected to mixed
flowing gas testing with half the samples mated and the other half samples unmated for the first
Chapter 5
Socket Environmental Requirements
23
Socket AM2 Design Specification
31875 Rev. 3.00
May 2008
five days, and then all samples mated for the final five days. The test temperature is 30°C with a
relative humidity of 70%. Mixed flowing gas constituents are 10-ppb chlorine, 10-ppb hydrogen
sulfide, 200-ppb nitrogen dioxide, and 100-ppb sulfur dioxide.
5.6
Mechanical Shock
Sockets must meet LLCR, continuity intermittency of less than 1-μs duration, and visual
inspection requirements after being subjected to mechanical shock testing at 50 g, 11-ms duration,
half-sine waveform with three shocks per positive and negative directions on all three axes —
totaling 18 shocks. This test should be conducted with the associated heatsink assembly (AMD
part number TBD) attached to the processor package.
5.7
Random Vibration
Sockets must meet LLCR, continuity intermittency of less than 1-μs duration, and visual
inspection requirements after being subjected to random vibration testing at 3.1 g rms between 20
to 500 Hz for duration of 45 minutes per axis for each of the three axes. This test should be
conducted with the associated heatsink assembly (AMD part number TBD) attached to the
processor package.
5.8
Resistance to Solder Heat
Sockets must meet LLCR, cover flatness, and visual inspection requirements after being subjected
to four convection-solder-reflow processes for mounting the socket to the PCB. Deterioration of
the markings on the socket is not permissible.
5.9
Resistance to Solvents
Sockets must meet visual inspection requirements after being subjected to the Four Solutions test.
Deterioration of the markings on the socket is not permissible.
5.10
Heatsink Assembly
The associated heatsink assembly (AMD part number TBD) attached to the processor package in
the environmental testing can weigh up to 500 grams.
24
Socket Environmental Requirements
Chapter 5