New build - CPU fans spin up at boot then stop as CPU heats up!

singh_uk · 1 Apr 2010 at 20:35

Hello,

I am in the process of building a new rig with

i7 930 w/ Venonous X & 2 Akasa Apaches in push/pull
GA-EX58A-UD3R
6GB Patriot RAM
Corsair 750W

I have started with the bare basics to see if the system boots, and it does, but the CPU fans spin up slowly when I start the PC, then stop completely. In the BIOS, the CPU temp read 30 and slowly climbed up to about 39 over a few minutes, then I switched the PC off. Both fans have been plugged into the 4 pin sockets.

My question is - is this normal? Will the fans only start spinning at a higher temperature? If not, what can I do to remedy the situation. Let me know soon! Thanks

OpenToSuggestions · 1 Apr 2010 at 20:42

The fan spazzes out at startup because the heat-sensors have not cut in yet.

Play a game or run a stress test (like prime95 or IBTv2) and the fan will spin.

singh_uk · 1 Apr 2010 at 20:52

Thanks for the information. I disabled the BIOS CPU-fan smart control and one of the fans fires up fine. The other one is connected to SYSFAN2 (ie a system fan plug) and doesnt move at all. I will install Windows, etc and see how things turn out.

The MCH temperature got up to 45 degrees in the BIOS - isnt that a bit hot?

Corasik · 1 Apr 2010 at 20:57

singh_uk said:
Thanks for the information. I disabled the BIOS CPU-fan smart control and one of the fans fires up fine. The other one is connected to SYSFAN2 (ie a system fan plug) and doesnt move at all. I will install Windows, etc and see how things turn out.

The MCH temperature got up to 45 degrees in the BIOS - isnt that a bit hot?

45 isnt even warm for an IC

. There may be options in bios to control the ramp up speeds of the fans, to disable fan control, or at least set a minimum speed that is greater than off.

People building HTPC's generally want fan speeds as low as possible, and arnt so bothered about overclocking, allowing a system to hit 50 degrees for example poses no risk to the hardware whatsoever, and can greately reduces the amount of time the fans are running.

Run something like coretemp and prime95, the fans should be running at a medium speed( or faster) as the cpu passes 50 degrees, and fullspeed by the time the cpu hits 60+.

singh_uk · 1 Apr 2010 at 21:16

Cheers guys the only other question I have - my Venomous X cooler doesnt feel entirely solid - I can "rotate" it very slightly - its not rock solid on the CPU despite having mounted it very carefully (and used the additional pressure screw to 70lbs of pressure!) - is this normal?

RJC · 1 Apr 2010 at 21:22

I have had coolers in the past which I could turn on the cpu after it was bolted down.

Essexraptor · 2 Apr 2010 at 13:54

singh_uk said:
Cheers guys the only other question I have - my Venomous X cooler doesnt feel entirely solid - I can "rotate" it very slightly - its not rock solid on the CPU despite having mounted it very carefully (and used the additional pressure screw to 70lbs of pressure!) - is this normal?

As long as you have full contact with the CPU you'll be fine.

I disable the fan speed control and just have the fan running at full speed. If it's a low noise one it does no harm.

PS. Nice to see someone else with a Q6700 Corasik!!