Instant CPU Overheating

[rabiet]

Hi!

First the PC I'm talking about:
Motherboard: Asus Z170M-Plus
CPU: Intel Core i7 7700k

CPU Cooler: ARCTIC Liquid Freezer 240

RAM: 16GB of HyperX Fury 2133MHz

GPU: Gigabyte Gefore GTX 970 G1 Gaming Edition

Power Supply: beQuiet Dark Power Pro 850W

I have a problem: About a month and a half ago I turned on my PC only to notice the fans would run at 100% all the time. I checked and indeed the CPU was at 100°C even in IDLE. I was a little shocked because that seemed a little insane to me. So I reverted the BIOS back to default settings and restarted the PC. Still the same. Then I wanted to test around a little bit. I set the core clock multiplier to the smallest value possible and dropped the voltage massively. That helped a little but not really. The fans were still at 100% but the temperatures were at 90°C. So I took my PC apart and rebuilt it completely. Using new Thermal Paste of course. Still the same.
So I figured my CPU had somehow taken damage from whatever. So I RMA'd it. The whole process of getting a new CPU actually took one and a half month. That's a lot of time that I was without my PC; so I've only been able to work from my laptop. You can imagine how pumped I was when the package with the new CPU arrived today. So I put the CPU in the slot, fired the PC up and after a little troubleshooting I got a POST (I actually had to reseat my RAM Sticks).

Not even bothering to check the temps because... Why would they be wrong? I have a new CPU... I used the PC and noticed that it was awfully slow which it really shouldn't be. Looked at the temps and there it is again. Same problem. Nothing was fixed with that new CPU.

 

Core voltage when left alone is 0.688V. At this voltage in IDLE the CPU still holds 100°C

 

My guess would be the VRMs on the Motherboard are doing some weird stuff they aren't supposed to? Does anyone have an idea? I thought about reflashing the BIOS but I'm afraid the PC is going to die during the process. Should I just RMA the motherboard? Could it be the power supply?

Sadly I do not have a spare motherboard laying around to test if that's the problem.

 

Thanks for your help!

rabiet

[seon123]

Is the pump on the AiO running?

[rabiet]

Yes, the pump is running

[johnukguy]

Did you replace the thermal paste and did you use a pea sized drop, as using too much may actually hurt thermals?

[rabiet]

Yes, I did that multiple times. I also used different thermal pastes from different companies even thought I'm not quite sure what I was hoping that would do.

 

And yes, I used an appropriate amount of themal paste

 

 

[Jurrunio]

Your choice of color for the system spec just gives those using day theme a hard time.

 

RMA the cooler.

[A Silver]

RMA the cooler. I got a new AIO today and my CPU was at 100 degrees at idle too and I am sending it back as eve after replacing the thermal compound and re seating the cooler, it still went to 100 degrees

[rabiet]

3 minutes ago, Jurrunio said:

Your choice of color for the system spec just gives those using day theme a hard time.

 

RMA the cooler.

Oh, I didn't even notice that color thing. Does look the same in dark theme and was more of an accident because I copied them from a document. Sorry.

 

Are you sure it is the cooler? Because Usually these CPUs don't even go above 60°C if you go into BIOS/UEFI even without a cooler. I would wonder how a cooler could make that worse.

[Santo22]

really sounds like a pump failure to me. I had a brand new Kraken x62 that was DOA and had the same exact issue. CPU would hit 70-80 degrees instantly. How do you know for sure the pump is running? I would bet money that this is the problem

[rabiet]

Wow. I feel a little stupid. I was pretty sure I checked the pump but it reports N/A RPM in the BIOS and I just disconnected all the fans to listen for the pump noise... There is none. Really does seem to be a pump failure!

Thank you all for getting me to recheck that! I would've probably been stuck for another month on that one!