cpu fan problem

[Gavin78]

My stock fan for some reason tonight has decided to go nuts, it seems to like spinning at around 4000/5000 rpm and I dont know why its decided to start doing that as idle is usually around 2500 rpm.

The temps are reading ok on the CPU around 40c and I did take the fan off and replace some thermal compound incase it was that but it hasn't made a difference.

I've tried an external program and Bios and temps are still around 37/40 C CPU usage is ok as well are ram which bothe aren't being taxed. the fan is around 6 months old so shouldn't be that?

[Mick Fisher]

Don't forget about ambient temperatures. Yesterday was the hottest day for five years in some areas.

[Gavin78]

Yeah I did think about that but I have 7 fans on my case 5 120mm fans and 2 140mm fans so got some good breeze coming through the unit.

2 at the back, 3 at the front and the 2 140mm at the top. It doesn't seem to be doing it today at least so far and I've left it running for a good few hours watching the temps and fan speeds with 3 different programs running monitoring the system.

[Mick Fisher]

Sounds more promising.

[Gavin78]

Yeah it seems to have been ok so far, not tried anything yet to tax the CPU though but I did order a better cooler than the stock one.

A cooler master V8

[Ramrod]

My stock fan for some reason tonight has decided to go nuts, it seems to like spinning at around 4000/5000 rpm and I dont know why its decided to start doing that as idle is usually around 2500 rpm.

Don't forget about ambient temperatures. Yesterday was the hottest day for five years in some areas.

Yeah I did think about that but I have 7 fans on my case 5 120mm fans and 2 140mm fans so got some good breeze coming through the unit.

But that just means you were really good at passing hot air through your PC.......

[Gavin78]

Originally Posted by Ramrod

But that just means you were really good at passing hot air through your PC.......

How do you figure that when the 2 top fans on my case are drawing air out and they are 140MM

While the 2 back fans are drawing air out and they are 120mm, the only fans I have blowing in are 3x 120mm fans and they also have dust filters on them cooling the HD's

http://www.youtube.com/watch?v=Nsl2gCYu3XA

[Ramrod]

Because unless you have figured out a way of blowing cooled air into the PC on a hot day then you are still dependent on the room temp air to have a cooling effect . It doesn't matter how much air you are blowing in/sucking out of the box.......if the room temp is too high you are going to be drawing in warmer than usual air and find your cpu/gpu getting hotter than usual and hence the fans spinning faster than usual......

[Gavin78]

Fair point!!!!

[Ramrod]

Thank you