Intel® Thermal/Mechanical Reference Design Information
R
Thermal/Mechanical Design Guide
39
5 Intel
®
Thermal/Mechanical
Reference Design Information
5.1
Intel Validation Criteria for the Reference Design
5.1.1
Heatsink Performance Target
Table 2 provides the heatsink performance target for the Pentium 4 processor in the 775–land
LGA package. The thermal profiles for the Pentium 4 processor 5xx sequence and Pentium 4
processor 6xx sequence and Pentium 4 processor Extreme Edition are derived so that a single
thermal solution will satisfy these processors.
The table also includes a T
A
assumption of 38 °C for the Intel reference thermal solution at the
processor fan heatsink inlet discussed Section 3.3. An external ambient temperature to the chassis
of 35 °C is assumed, resulting in a temperature rise, T
R
, of 3 °C. Meeting T
A
and
Ψ
CA
targets can
maximize processor performance (refer to Sections 2.2, 2.4, and Chapter 4). By minimizing T
R
, in
the performance chassis, this helps lead to improved acoustics.
Refer to the datasheet
for detailed processor thermal specifications.
Table 2. ATX Reference Heatsink Performance Target
Processor Number
Thermal Performance,
Ψ
ca
(Mean + 3
σ
)
Comments T
A
Assumption
Intel
®
Pentium
®
4 Processor
670/672, 660/662, 650, 640, and
630
0.28
°
C/W RCBFH-3
T
A
= 38
°
C
Intel
®
Pentium
®
4 Processors
570/571, 560/561, 550/551,
540/541, 530/531, and 520/521
0.29
°
C/W RCBFH-3
T
A
= 38
°
C
NOTES:
1. The target performance in Table 2 is the Thermal Profile for processors with PRB=1.
2. Solutions to support processors with PRB=0 may be derived from designs supporting the thermal profile
for processors with PRB=1.
3. Refer to Section 5.6 for complete description of the Intel ATX reference solution RCBFH-3.
Summary of Contents for 640 - Pentium 4 640 3.2GHz 800MHz 2MB Socket 775 CPU
Page 14: ...Introduction R 14 Thermal Mechanical Design Guide ...
Page 38: ...Thermal Management Logic and Thermal Monitor Feature R 38 Thermal Mechanical Design Guide ...
Page 52: ...Intel Thermal Mechanical Reference Design Information R 52 Thermal Mechanical Design Guide ...
Page 60: ...Acoustic Fan Speed Control R 60 Thermal Mechanical Design Guide ...
Page 72: ...Heatsink Clip Load Metrology R 72 Thermal Mechanical Design Guide ...
Page 99: ...Mechanical Drawings R Thermal Mechanical Design Guide 99 Figure 50 Reference Fastener Sheet 1 ...
Page 103: ...Mechanical Drawings R Thermal Mechanical Design Guide 103 Figure 54 Clip Heatsink Assembly ...
