AMD AMD Athlon 64, Thermal Design Manual, Page: 18 / 82

Preliminary Information
AMD Athlon™ 64 and AMD Opteron™ Processors
Thermal Design Guide 26633 Rev. 3.03 September 2003
2.4 Thermal Solution Design Requirements
To maintain the case temperature of the processor below the maximum specification, certain
heatsink design parameters must be considered. Table 2 provides the design-target specifications
that must be met for the AMD Athlon 64 and AMD Opteron processors to operate reliably.
Table 2. Thermal Solution Design Requirements for the AMD Athlon™ 64 and
AMD Opteron™ Processors
Symbol Description Minimum Maximum Notes
L Length of heatsink 77 mm 77 mm Measurements are for
the entire assembly,
including attached fan.
W Width of heatsink 68 mm 68 mm
H Height of heatsink 60 mm
θ
CA
Case-to-ambient
thermal resistance
0.28°C/W
m
HS
Mass of heatsink 450 g
F
CLIP
Clip force 60 lb 90 lb
T
A
Local ambient
temperature near
processor 42°C
32 dbA The preferred level is to
have no annoying tones.
L
PA
Sound pressure
measured 1 m
from fan
38 dbA Maximum level is at
room temperature with
no annoying tones
18 AMD Athlon™ 64 and AMD Opteron™ Processors Thermal Requirements Chapter 2