CPU overheating, or is it?

[jontyl]

Hey, I have had no problems with the performance of my PC, but recently my CPU fan has been maxing out at 5000+ RPM. I'm sure you can imagine the sound this is creating. I recently downloaded the software 'speedfan' with which I can control the speed of my fan, and I noticed that it says my CPU temp is 65C normally, sometimes reaching 75C. This is far too hot for a CPU as far as I know, but everytime I check CPU temperature in the BIOS it is at a normal 43C or so...

So, basically I'm confused, which is it?? I can understand that the CPU is overheating for whatever reason, causing the fan to spin faster, but why does the bios say its at normal temps?

Also, I wonder if there is a problem with the censors for temperature on this motherboard. Maybe I should use a different motherboard, or upgrade the bios?

Any help is appreciated

 

[teknic111]

Download Core Temp and get a reading from that.

 

[jontyl]

Well I downloaded core temp, and I get a 64C, 62C low, 65c high


Any ideas on why my CPU is overheating so much (it is non-OC phenom ii 940 quad core)

 

[jontyl]

Ok, just pushed the CPU fan to max RPM cooled to 50C, still too hot though

 

[teknic111]

I would take the heat sink off the cpu and re-seat it. Clean off all the old thermal paste and apply new paste.

 

[jontyl]

Ok, but I have tried that several times. I have bought arctic silver 5 thermal paste, which should be good enough. I applied it well, that can't be the problem

But, beforehand I cleaned the CPU and fan base with methylated spirits. This may be a problem, as I have heard isoproponal (isopropyl alcohol) referred to everywhere for purifying CPU and fan, but since meths is still alcohol I guessed it wouldn't be a problem...

Apart from that the only thing I can think of is to get a new CPU fan... but then again I haven't overclocked so I thought stock fan would be sufficient

 

[kajabla]

I cleaned with alcohol and it's fine. You may have applied the thermal paste badly, perhaps too thickly. Also, your case ventilation will have a big impact on all the temperatures in it. Can you supply all your specs? Case, CPU, GPU, ambient temps, idle and load temps, etc etc.

 

[jontyl]

Useless cheapy case from ebuyer, only one case fan
CPU is Phenom ii x4 940 (non OC)
GPU is 8800GTS 320MB XFX with fan

Idle Temp -> 48C
Load Temp -> 60C

Although my case has bad ventilation, it is open atm but still high temps
Thermal paste applied thinly...
I will try a large household fan outside open PC to see whether its a ventilation issue
Thanks =)

 

[jontyl]

Oh and Ambient temp is 40C

 

[jontyl]

Well, interesting...
In assassin's creed the computer just powered off, which has never happened before, so I guessed my psu was a problem.
So, I took out my 8800gts, and then all of a sudden the cpu fan RPM have drastically fallen?? but the temps pretty much the same.
Ran P95 and it got to 61C (core temp), at which point I turned off the stress test, (since 62 is AMD said max temp)

So, 44C idle now and 61C max (but could be higher).. still too hot for my liking

I am going to get a new PSU anyway now to account for the GPU, but could a new PSU also fix my overheating problems?