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[SOLVED]
So I recently replaced some parts in my PC. While checking things out I noticed a problem, which is worrying me a little. After some more poking and testing I found something that made this potential issue into an interesting situation - to me anyway!
Some specs: Intel i5 2500k 3.3ghz
Corsair H60 Water cooling
Asus Z68-VLX motherboard
8gb RAM
nvidia 560 ti
Coolermaster 650 psu
So Speedfan is listing my CPU at around 84C and all my cores at under 40C, a google of this problem brought me to a previous thread on this site and reading that I thought everything was ok. However, someone mentioned to try out a program called Real Temp which also measures the temps of cores and I tried that out to broaden my evidence that the cores are running at a good temperature.
Pic: ![[image loading]](http://i.imgur.com/12YsI.jpg)
Here is a pic showing temperatures at 12% load. As you can see, RealTemp lists the cores at temps from 30C to 35C and SpeedFan shows cores at 33C to 37C. Speedfan also lists my CPU as running at 78C.
So at this point, it's looking like its just giving me an "arbitrary reading" as the the socket it is drawing this information from is empty.
Now a friend told me to run a program called Prime95 which would show temps under load. So that's what I did. unsurprisingly my cores went up to high 90C under the 100% load but shockingly Speedfan's CPU reading suddenly changed to a cool 20C!
Pic: ![[image loading]](http://i.imgur.com/VCPVC.jpg)
So I ask, why would the CPU temp reading be so high while under 12% load and so cool under 100% Is everything fine? Should I be turning my computer off ASAP?
Any help would be much appreciated. Thanks for reading!
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Mid 90s is way too high for running prime95 on a 2500k. There is clearly an issue, either improperly applied heatsink/thermal paste, or your overclock has some issues, although it looks like you're only overclocking to 4ghz, so that shouldn't be it. I suppose you could have some ridiculous voltage setting...
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Speedfan is garbage.
But reaching almost 100c under prime95 is a serious problem.
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I don't think you installed your watercooling properly. 98c is the TJMax, when you reach that the processor will throttle itself down(think of it has a fail safe measure). I wouldn't be overclocking if you are reaching temperatures like that, you need to make sure you installed everything properly. When I got my i5 2500k using stock heatsink and fan I didn't go above 72c on prime95.
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The value you read out from the CPU isn't the actual temperature. In the case of Sandy Bridge, the readout value decreases with increasing temperature. Apparently SpeedFan doesn't have the correct conversion programmed into it, which causes it to show the "temperature" becoming lower under load.
RealTemp is a very good temperature monitor and you can rely on it to convert the readout values to actual temperatures properly. Your idle temperatures look okay, but the temperatures with Prime95 are way too high. For a mildly overclocked setup (which your 4 GHz is) it should definitely not go over 70 with decent cooling. The second line of numbers in RealTemp, "Distance to TJ Max" indicates the distance to the throttling threshold, the temperature at which the CPU will actually clock itself down to prevent damage from overheating. You're only a few degrees away from that when running Prime95!
Your SpeedFan voltage reading is 1.33V under load. I'm not sure if SpeedFan reports the correct voltage. Check it with CPU-Z or RealTemp to be sure. In any case, 1.33V is a bit high for a 4 GHz overclock, you should be able to get that speed with a lower voltage. But 1.33 isn't so high that it should heat up your CPU to over 90 degrees.
Check that your cooler is functioning properly and that you properly applied the thermal paste.
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Ok, so I did a couple of things suggested through here. (I hadn't actually intentionally overlocked my CPU lol!) I went to bios and saw it was set to "Performance" rather than "normal" or "eco" - it's now on normal and I think that has reduced the voltage my processor was getting.
I also refitted the water cooling part that is over the processor and reapplied the thermal paste. Here is a pic of the temps under 100% load now:
![[image loading]](http://i.imgur.com/VPELt.jpg)
Looks to be much better! thanks for all of your advice and help!
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Those are decent starting temperatures. You can start overclocking a bit to squeeze out some extra performance.
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EPT
