CPU temps suddenly 90°C

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Hi, after a little help if possible.

I have an Asus Rampage IV Extreme motherboard and Intel i7 3930K CPU, that has been cooled for the last 11 years with a Corsair H100 AIO CPU cooler.

A couple of weeks ago, I turned the pc on, and had a warning about CPU fan failure. I had a quick look inside the pc and could see smoke coming from the H100 cooling block. Needless to say I powered the pc off and checked it wasn't leaking (it wasn't), it was just the H100 fan controller that had packed up and was no longer lighting up (it's done well to last this long). So I set the bios to ignore the cpu fan. and the pc ran fine, the fans still ran but were just at the default speed, meaning CPU idle temps in the current heat have been around 58 - 60°C, instead of around 45 - 50°C when the fan controller worked properly. But even under load staying the CPU temps remained below 70°C

Last night however, this suddenly rose to 88 - 91°C at idle and there was a lot of heat coming out from under my PC desk (the unit is on the floor under my desk).

So I purchased a new 360mm AIO unit, (I will admit it was just a cheap unit from Amazon as I needed something quickly and figured even a cheap unit should work better than a failing 11 year old H100), as I assumed the pump must now also be failing in the H100.

After installing the new cooler (cleaned off all the old thermal paste properly and applied new that came with the new AIO cooler), having switched the PC on, the idle temps were still around 90°C.

Now that I have control of the fans again, I can up the speed to 2000rpm (noisy) and this will drop the idle temps to around 60°C again, but the moment I do anything (click between web pages, check email, chat on telegram etc etc) the temps jump straight back to 90°C even with the fans running 100%, however the air coming out of the top of the pc (and from under my desk) is nowhere near as hot as it was last night.

So I am now a bit lost.

Does this sound like the new AIO cooler is really bad or even faulty ? According to the bios the pump is running at 5300rpm, and the fans are around 2000rpm, but even in just the bios screen i'm seeing 75°C CPU temps.

Or does it sound more like the temp sensor on the motherboard is faulty ?

Core Temp, HWInfo, FanController 161 and FanSpeed 4.5.2 all show roughly the same CPU / core temps as each other.

I know it's an old system and there is far better options available now, but it does what I need for the most part and I don't really see the point of upgrading to anything newer at the moment.
 
your h100 is toast.

did you remove the plastic wrapper from the new aio?

AIO is faulty or you've not mounted it correctly.
Thanks guys.

Just took it apart again, to double check everything and also make sure I didn't use too little thermal paste.

Turns out the CPU had perfect coverage (maybe slightly too much as it just went over the edges very slightly, but not enough to drip down).

Anyway I took a closer look at the block, and it turns out it had 2 protective covers on it (wtf), not sure it was meant to have 2, but nothing in the instructions said anything about there being 2 protective covers to remove.

The one I removed had writing on it, but there was a 2nd one still on the block that was completely clear, it was only when I used the torch on my phone I noticed the lip / pull for the 2nd cover.

Cleaned up the paste on the CPU, applied some fresh (a bit less than before) put it back together and now the temps are down to 40 - 45°C at idle without the fans running 100%.
 
Anyway I took a closer look at the block, and it turns out it had 2 protective covers on it (wtf), not sure it was meant to have 2, but nothing in the instructions said anything about there being 2 protective covers to remove.

The one I removed had writing on it, but there was a 2nd one still on the block that was completely clear, it was only when I used the torch on my phone I noticed the lip / pull for the 2nd cover.

did you remove the plastic wrapper from the new aio?
Totally called it :cry:
 
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