I'm using a Supermicro SNK-P0064AP3 heatsink to cool an EPYC 7763 on a Supermicro H12SSL-I motherboard. I have several identical machines and have noticed that on one machine the CPU temperature seems to be 10 degrees Celsius warmer than on others. Typically, when idle, this processor on other similar machines has a temperature of 35 degrees Celsius in this room, while on this particular machine it is 45 (see screenshot ipmi.png).
I removed the radiator. Then, from the imprint of thermal paste (Arctic MX6), I realized that the heatsink did not fully adhere to the processor. You can see it in the photos attempt1_1.png and attempt1_2.png. Then I replaced the motherboard with the same one and replaced the SNK-P0064AP3 heatsink with the same one, just a different copy of the SNK-P0064AP3. The result also looks unsatisfactory: see photos attempt2_1.png and attempt2_2.png. In these photos, you can see that even the stripes that I left when I smeared the thermal paste with the Thermal Grizzly spatula were preserved on the thermal paste. Thus, in these places, the heatsink did not exactly adhere to the processor. I'd say the heatsink fit is only about 60% of the CPU surface.
Then I thought that I wasn't tightening the screws well enough. I use a high quality Wera screwdriver WE-051205 or a WIHA antistatic screwdriver. I twist the "cross" in the following order:
As a result, in idle I have a temperature of about 42-45, and in the mprime test up to 65 and even 70 degrees for a short while.
Q: Do you think I should apply more force when screwing on the heatsink? or should I tighten the screws in a different order? Or continue to work like this, because the temperature in idle time does not look critical? Does anyone know the force with which the radiator screws must be tightened (in Newton per meter)?
Thank you!
I removed the radiator. Then, from the imprint of thermal paste (Arctic MX6), I realized that the heatsink did not fully adhere to the processor. You can see it in the photos attempt1_1.png and attempt1_2.png. Then I replaced the motherboard with the same one and replaced the SNK-P0064AP3 heatsink with the same one, just a different copy of the SNK-P0064AP3. The result also looks unsatisfactory: see photos attempt2_1.png and attempt2_2.png. In these photos, you can see that even the stripes that I left when I smeared the thermal paste with the Thermal Grizzly spatula were preserved on the thermal paste. Thus, in these places, the heatsink did not exactly adhere to the processor. I'd say the heatsink fit is only about 60% of the CPU surface.
Then I thought that I wasn't tightening the screws well enough. I use a high quality Wera screwdriver WE-051205 or a WIHA antistatic screwdriver. I twist the "cross" in the following order:
- Lower right
- Top left
- Upper right
- Lower left
As a result, in idle I have a temperature of about 42-45, and in the mprime test up to 65 and even 70 degrees for a short while.
Q: Do you think I should apply more force when screwing on the heatsink? or should I tighten the screws in a different order? Or continue to work like this, because the temperature in idle time does not look critical? Does anyone know the force with which the radiator screws must be tightened (in Newton per meter)?
Thank you!
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