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So I assembled this computer and I think I made a mistake with the fan positioning. My CPU temp goes up to 80 degrees and I have to open the case and put a fan under the case to bring it down. It comes down to 45-50 when I do this.

P.S. Could this temperature have already damaged the CPU? It might have operated for a total of 100-200 hours at this temperature is the past 2 months. I built it exactly 2 months ago.

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I have a new ASUS Rampage IV and a Intel Core-i7 3820, I use the recommended fan made by intel for the CPU.

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If it gets that hot, then first check the obvious: The CPU cooling itself. Is there a thermal pad (with plastic protection removed!) or thermal paste? – Hennes Apr 23 '13 at 23:14
yes there was silicon on the CPU fan when I bought it – Neo Apr 23 '13 at 23:25
The stock Intel fan isn't really that good; make sure all of the mounting pins are firmly pressed down. Actually, it 80C isn't that surprising at all: you have two hot GPUs right under it. Do the GPUs vent air outside of the case? Edit: Also, manage the cables a bit better for improved airflow. – Rain Apr 23 '13 at 23:25
First I agree with the above, The mounting and goop on the CPU sync would be first priority.Cool pic, which direction is the PSU fan (down and out I assume)? Some people would say you are creating a slight vaccume pressure, when you have 4out and only 1 in, if it is a closed case VS a grilled or more open style of case that is more popular today. FANOPT might be better off bringing in cool air to the cpu heatsync area. Your using a stock intel sync? because there are even cheapo syncs that will be "better" but mostly needed when overclocking, as the stock is sufficient when not overclocking. – Psycogeek Apr 23 '13 at 23:29
Let's just get this question out of the way for clarity: Have you overclocked the CPU or is it running at the stock speed? – Fopedush Apr 23 '13 at 23:32
up vote 3 down vote accepted

I take it that you are either having problems with thermal throttling or are overclocking.

[Warning: Overclocking can damage your components]

Make sure that if you are overclocking that you go up in increments on the clock speed and Voltage. Test run it at each new speed to see if stable. Overclocking generates extra heat and suitable precautions ought to be taken before embarking [go to 5].

  1. Improve your airflow by tidying your cables. Proper cable management will improve the passage of air through your case.

  2. Use decent thermal paste as the stuff that is on stock fans is okay but you can get better performance with the aftermarket stuff.

  3. Crank up the fans; if they are running very slow the air will not be displaced quick enough to cool the ambient case temperature [Warning this can get very noisy and is not recommended for HTPC setups go to 5].

  4. Clean your case. A build-up of dust within your case will cause your components to overheat. If your case does not have filters then a good clean will help. Most people tend to keep their PCs on the floor under their desk where airflow is not optimum.

  5. To achieve a better result, change your current Air Cooled CPU Cooler. There are a number of sealed liquid cooled CPU Coolers on the market at very reasonable prices which would reduce the heat from your processor. If you can afford it go for a fully blown liquid cooled system which could also cool your GPU or refrigerated PC case, both of which are expensive.

Article on CPU Coolers:

Not sure if anyone is still making them but here is an example of the refrigerated PC case:

If you want to get extreme:

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Two things I could think of:

  1. Make sure you don't have too much silicon paste on the CPU. Lots of HP laptops at work had this issue so we had to actually remove silicon.
  2. Computers these days seem to have vents that blow the air out of CPUs directly out of the box. Might want to look into vents.
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Looks like he's got three fans very close to the CPU all exhausting air -- shouldn't need any more than that. – Fopedush Apr 23 '13 at 23:34
I hope you mean silicone, not silicon... :D – Anonymous Penguin Jun 10 '14 at 21:51

From seeing OP's diagram, I would say switch the one top fan nearest the front of the case to blow air out of the case. I had my 2 fans on top set up like yours and then was informed that, you still get air circulation.

Mine were set up to blow out of the case, but I think by doing that for both fans, it puts more strain on those fans as they are trying to pull out all the heat, whereas if the fan above the processor is blowing into the case, and the other top fan is blowing out of the case, you'll have that air circulating.

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