CPU really inefficient and really high temps?

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6 Jun 2015
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Hi, I'm new here and I'm looking for some feedback on an issue I'm having...

I've been experiencing issues with my system since last week, I have noticed that doing anything on Windows 7 is suddenly taking a lot of effort on the CPU (browsing the web or even typing causes spiking in CPU usage). I thought it was an issue with the OS, but when I checked my temperatures with Core Temp the temperatures were all extremely high (around 80 degrees celsius). Running Prime95, I saw the temps rise to around 97 degrees, so I turned off the system to prevent any further damage.

I decided to inspect my cooler (I'm using a Corsair H80) and noticed that the CPU block was unplugged from the PSU, as the pump control wasn't lit up. So I thought I should re-fit the cooler, just to be sure that everything was set up correctly. I cleaned off the old thermal paste and applied a small blob of fresh paste, after removing the radiator from the fan and cleaning the dust out. I removed the block after placing it down to ensure that the paste was being spread well enough, it had reached the corners well enough so I assumed the block was fitting it tightly.

I re-mounted the fan and radiator and plugged the 3-pin connector back into the 'sys fan' plug on the motherboard. Then I plugged the cooler block's power connection into the connector for the PSU, which seemed to turn on the pump. However despite having the cooler properly plugged into the PSU, running Prime95 still puts the temps up to 97 degrees.

My guess is that the pump isn't working properly anymore. The fan spins fine, but despite the temperatures for the processor reaching 97 degrees the air coming from the radiator was stone cold. There liquid is still in the system, I can hear it sloshing around when I turn the radiator over, but no heat seems to be transferred from the block to the radiator. I'm hoping this is a fixable issue, maybe I've wired the H80 up wrong but I don't think I've missed anything. I wasn't the one who installed the cooler in the first place but I noted that the only thing plugged in when I took it out was the fan wire.

Any help with this would be greatly appreciated!
 
Should it be plugged into the cpu fan header, not the system fan header? Not that it should really make much difference.
 
Hi and welcome to the forums.:)

Which cpu is it, and is it at stock speed or overclocked?

Hi, sorry it looks like my signature isn't showing properly. I have an i7-2700K @ 3.5Ghz, it used to be o/c'd @ 4.5Ghz but it had stability issues so I brought it back to stock. But that was changed back soon after I got the system (got it in January 2012).

Should it be plugged into the cpu fan header, not the system fan header? Not that it should really make much difference.
I thought it should have been plugged into the CPU fan header too, but I wasn't too concerned when the fan was operating anyway.
 
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you have 2 issues. or 1 of them.

block is not seated properly
pump is broken

Seems a flow rate issue as no heat transfer from cpu to radiator being under load @97c with the radiator not even warm indicates flow rate issue or pump issue or heatsink block not sitting properly.
i would go with a flow rate issue, pump not working correctly.
 
you have 2 issues. or 1 of them.

block is not seated properly
pump is broken

Seems a flow rate issue as no heat transfer from cpu to radiator being under load @97c with the radiator not even warm indicates flow rate issue or pump issue or heatsink block not sitting properly.
i would go with a flow rate issue, pump not working correctly.
Well I've managed to get a hold of my stock cpu fan. I've installed it using the same procedure as the the H80 but in this case I'm getting around 25 degrees at idle and just under 60 at full load.

What are your full system specs buddy?
Hi Russell, should be in my sig now, unless there's anything else I should add?
 
It sounds like your pump is either dead or not running within spec.. You can test the pump just for confirmation if you like. Since you have already pulled out the cooler, you can plug in the 3pin pump to any of the fan header on your board, then you can connect the molex to your PSU. Fire up your system and go into your BIOS. Check the rpm of the fan header where you have the pump connected. If its 0 rpm, then the pump is dead. If its running way below 2200rpm, then its faulty. Either way, if any of those 2 is the case, I'd suggest that you take advantage of your warranty and have it replaced via RMA.

You do have a 5 year warranty from us. You can start the request at Corsair.force.com
 
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