Intel Xeon Processor with 800 MHz System Bus Thermal/Mechanical Design Guide

28 Intel® Xeon™ Processor with 800 MHz System Bus Thermal/Mechanical Design Guidelines
Thermal/Mechanical Reference Design
If other custom heatsinks are intended for use with the Intel Xeon Processor with 800 MHz System
Bus, they must support the following interface control requirements to be compatible with the
reference mechanical components.
Requirement 1: Heatsink assembly must stay within the volumetric keep-in.
Requirement 2: Maximum mass and center of gravity.
Current maximum heatsink mass is 1000 grams [2.2 lbs] and the maximum center of gravity 3.81
cm [1.5 in.] above the bottom of the heatsink base.
Requirement 3: Maximum and minimum compressive load.
Any custom thermal solution design should meet the loading specification as documented within
this document, and should refer to the Intel® Xeon™ Processor with 800 MHz System Bus at 2.80
GHz and 3.60 GHz Datasheet for specific details on package loading specifications.
2.4.6 Thermal Profile Adherence
The 2U+ CEK Intel reference thermal solution is designed to meet the Thermal Profile A for the
Intel Xeon Processor with 800 MHz System Bus. From Table 2-6, the three-sigma (mean+3sigma)
performance of the thermal solution is computed to be 0. °C/W and the processor local ambient
temperature (T
LA
) for this thermal solution is 40 °C. Hence, the Thermal Profile equation for this
thermal solution is calculated as:
Equation 13. y = 0.305x + 40
where,
y = Processor T
CASE
value (°C)
x = Processor power value (W)
Figure 2-8. 2U+ CEK Heatsink Thermal Performance
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0 102030405060708090100
CFM Through Fins

ca
, C/W
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80

P, inch water
Mean 
ca
= 0.2269 + 1.2225*CFM
-0.9397
 = 0.0086 C/W

P = 5.52e-05CFM
2
+ 5.24e-03CFM
∆P = 5.52e-05CFM
2
+ 5.24e-03CFM
Mean Ψ
ca
= 0.2269 + 1.2225*CFM
-0.9397
σ = 0.0086 C/W
Ψ
ca
, C/W
∆P, inch water
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0 102030405060708090100
CFM Through Fins

ca
, C/W
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80

P, inch water
Mean 
ca
= 0.2269 + 1.2225*CFM
-0.9397
 = 0.0086 C/W

P = 5.52e-05CFM
2
+ 5.24e-03CFM
∆P = 5.52e-05CFM
2
+ 5.24e-03CFM
Mean Ψ
ca
= 0.2269 + 1.2225*CFM
-0.9397
σ = 0.0086 C/W
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0 102030405060708090100
CFM Through Fins

ca
, C/W
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80

P, inch water
Mean 
ca
= 0.2269 + 1.2225*CFM
-0.9397
 = 0.0086 C/W

P = 5.52e-05CFM
2
+ 5.24e-03CFM
∆P = 5.52e-05CFM
2
+ 5.24e-03CFM
Mean Ψ
ca
= 0.2269 + 1.2225*CFM
-0.9397
σ = 0.0086 C/W
Ψ
ca
, C/W
∆P, inch water