Preliminary Information
26633 Rev.
3.03 September
2003
AMD Athlon™ 64 and AMD Opteron™ Processors
Thermal Design Guide
A.1.2 Heatsink
Thermocouple
Attachment
1) Drill a 1.5-mm diameter hole in the heatsink base as shown in Figure 20.
Figure 20. Heatsink Thermocouple Relief Groove and Measurement Hole
2) Inject thermal grease, such as Dow Corning 340, into the hole with a needle.
3) Insert thermocouple into hole until the bead touches the bottom of the hole.
4) Tape the thermocouple wire in place to prevent removal and add strain relief.
A.1.3 Ambient
Thermocouple
Attachment
The ambient thermocouple should be placed such that it captures the temperature of the air
entering the heatsink. The placement for active heatsinks (fan attached) should be about 25 mm
away from the fan inlet and centered over the fan.
For passive heatsinks, place the thermocouple about 25 mm upstream from the heatsink and about
50 mm above the motherboard surface.
Appendix
A
Appendix
40