Core i5 750 overheating with stock cooler

[FBW]

Hi everyone.

My core i5 750 is overheating under full load and I think it's because the fan is defective. I use the stock cooler but that shouldn't be a problem because I don't overclock.

Anyway, the idle temp is around 35 °C and the fan is at 2000 rpm.
With prime 95 or linx or any program to stress the cpu, the temp goes up to 85 °C in just a couple of minutes, and keeps going up if I don't stop the test to avoid damage to the processor.

I'd like to know the maximum speed of the stock cooler for the i5 750 because it always stays at 2000 rpm, and I don't think that's normal.

Thanks in advance for your help.

 

[Harvey]

Did you use any heatsink compound, or was there just a strip of it on the HS?

If you're using what came with the HS, and you want use to one of the after market heatsink compounds, try Arctic Silver 5 or one of the other known good ones.

Windex works well to remove old compound. When you apply the new stuff, use a VERY thin coating. The compound is intended to fill microscopic gaps between the surface of the HS and the chip. Anything more will impede thermal contact, not improve it. I usually put a small BB size drop on the chip and use my finger to spread it. Windex removes it from fingers, too.

In this thread, last month, others and I gave similar advice, and the OP reported that his CPU temperature went down 8°.

If you suspect the fan is defective, especially if it's a multi-speed fan that should speed up at higher temps, you may want to check the spec'd rotation speeds for the fan and the settings in your CMOS that determine when it should go to higher speed.

Hope that helps.

 

[FBW]

I didn't build this system myself, but I'm certainly using what came with the stock heatsink.
But before replacing the thermal paste (or getting a new cooler), I'm trying to figure out if there is a problem with this fan since I still have warranty.

I found this document on Intel's website. Page 80 is interesting because, if I'm not wrong, this fan should reach 3000 rpm.
I tried enabling Q-Fan control from the bios, setting it to turbo, but my fan never reaches that speed. Actually, the fan slows down to 1500 rpm at idle, but under full load it's the same.

What do you think?

 

[Seero]

I didn't build this system myself, but I'm certainly using what came with the stock heatsink.
But before replacing the thermal paste (or getting a new cooler), I'm trying to figure out if there is a problem with this fan since I still have warranty.

I found this document on Intel's website. Page 80 is interesting because, if I'm not wrong, this fan should reach 3000 rpm.
I tried enabling Q-Fan control from the bios, setting it to turbo, but my fan never reaches that speed. Actually, the fan slows down to 1500 rpm at idle, but under full load it's the same.

What do you think?

Boot into BIOS, play with the fan speed. If you set CPU fan speed to 0, but it is still spinning, then you probably have plugging it into the wrong connector. Trust your ears instead of the RPM you see from Q-Fan, it can be way off.

If it is under warranty, don't be afraid to use prime95 for an hour to see if it does throttle, BSoD, or automatic shut down. If it does, bring the computer back to where it came from and have them fix it.

Side note, those thermal paste that comes with the heatsink usually suck, but that do work. Prime95 is used to test max CPU load, not average load. As long as it doesn't crash, then your PC is stable. Throttling during prime95 is arguable, but the case is valid.

 

[Zorander]

It's possible also that the heatsink is not properly/tightly installed. Try re-seating it and see if it helps with the abrupt temperature increase. Re-apply the thermal paste while you are at it.

Cheers!

 

[FBW]

Boot into BIOS, play with the fan speed. If you set CPU fan speed to 0, but it is still spinning, then you probably have plugging it into the wrong connector. Trust your ears instead of the RPM you see from Q-Fan, it can be way off.

If it is under warranty, don't be afraid to use prime95 for an hour to see if it does throttle, BSoD, or automatic shut down. If it does, bring the computer back to where it came from and have them fix it.

Side note, those thermal paste that comes with the heatsink usually suck, but that do work. Prime95 is used to test max CPU load, not average load. As long as it doesn't crash, then your PC is stable. Throttling during prime95 is arguable, but the case is valid.

On my motherboard (ASUS P7P55D LE) you can't set the cpu fan speed. You can only choose between Q-Fan profiles (standard, silent, turbo) or disable it.
But I can tell you that it's connected to the CPU_FAN connector on the motherboard, so that's OK.

I tested again with prime 95, in less than five minutes the cores reached 99 °C and the processor started throttling.
I'll bring it back to the shop, it's the best thing to do.

It's possible also that the heatsink is not properly/tightly installed. Try re-seating it and see if it helps with the abrupt temperature increase. Re-apply the thermal paste while you are at it.

Cheers!

I could try to apply new thermal paste or reinstall the heatsink, but I don't want the risk of voiding the warranty, since it's under warranty until november.

Thank you all for your help.

P.S. If anyone can take a quick look at the document in my previous post and understand the maximum speed of the fan, please let me know. Thanks.

 

[Zorander]

I could try to apply new thermal paste or reinstall the heatsink, but I don't want the risk of voiding the warranty, since it's under warranty until november.

Thank you all for your help.

Reason I mentioned about re-seating the HSF is because I have experienced similar issue, i.e. abrupt increase in temp under load, both personally and from helping friends with similar issue. In all cases, the HSF was loose and hence was not properly contacting the CPU. Reseating, even when re-using the existing thermal paste, always solved the problem.

But it seems you are not comfortable with this mucking around (and potentially voiding your warranty), so I agree that you should bring it back to the shop. After all, the system they sold you is problematic so they should fix it.

Cheers!

p.s. At full speed, the Intel cooler goes beyond 3000rpm (I don't have the hundreds figure).

 

[HarlanPepper]

I was getting really high stock temps on my i5 750 until I changed the CPU voltage setting from Auto to Normal (I believe that's what it was called) on my Gigabyte P55A-UD4P. Might want to check on your voltage, because that brought my temps down at least 10c at load.

But if you're hitting 99c, it's likely another issue - but voltage may be at least partially contributing.

 

[Harvey]

I could try to apply new thermal paste or reinstall the heatsink, but I don't want the risk of voiding the warranty, since it's under warranty until november.

There's the operative. The vendor is responsible for making it work or replacing any defective component on their dime. Their service was included in your purchase price.

Do it, and, if they can tell you what the problem was, you may learn something new along the way.