Originally Posted by hucklebuck
Anyone here have a fan on the back of the CPU socket to help cool it off. If so what size do you use, and has it helped?
I've got a small chipset fan on mine and it helps. Was thinking of putting a bigger fan there.
Take a look at both threads.
Take the findings however you feel to take them but in my "OPINION" and as I feel the data I recorded suggests that fan cooling the VRM sinks and the back of the motherboard make a measurable difference that extends to the temperature of the CPU itself regardless of air or water cooling.
I did not find that cooling the back or vrm sinks helped the Z68/Z77 boards at all even on a decent OC. I would guess that is because of the intel being more efficient.
If you cool the sinks like I did you can probably turn up the frequency of your VRMs without much of a problem heat wise.
I tried the Intel with the VRM frequency pegged and the all the VRM settings on extreme and current not thermal and still the fans made no difference in CPU temp and I couldn't measure the VRM temp because it doesn't have the same monitoring that the sabertooth has. However touching the sinks with my fingers they are barely warm.
As for the Sabertooth 990FX the more current your CPU draws and the higher the VRM temps you are getting the more these fans will make a difference.
Use 40-60mm for the top sinks and 80-120 on the back side. Personally I prefer 80 on the back and off to the side between the VRM heat sink bottom plate and the cpu socket.
Not sure where the majority of the cooling comes from... It could be that you are cooling the socket or it could be that you are cooling the VRM bracket which gets extremely hot.
The single small fan was enough but I tried dual small fans and dual 80mm 4000RPM fans and honestly I felt the single small fan was plenty with a 80 on the back side.
The way I did the Intel... you can do this with the 990FX as wellEdited by givmedew - 4/5/13 at 1:19am