cpu temperatures 90c after a few minutes

chucklepie

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Jul 4, 2012
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Hello,
I've just checked three PC's I've built, all with intel i5 2500 and stock fan/heat sink, not overclocked, with a good case (intel thermal compliant - or whatever the term is!).

I've had them about a year and just checked the temperatures, all were low apart from the CPU which after just a few minutes were about 80-90C with nothing running. After running for a long time they are about the same. The ambient temperature is probably about 18 to 19C. I've cleaned them all inside and removed all dust from fans/fins, etc too.

On all I have an asus motherboard, a mini case, 6850 graphics card and one 8cm fan on the rear and a cx450 builder series psu.

Is the issue something requiring more cooling inside the case (i.e. does case cooling matter - though everything else like HDD, etc is fine) the issue or do I need to think about changing the fan/sink?

Thing is, if it's the stock fan, why are they shipped if they are all failing? they come with built in thermal paste/pad so it's not how I applied it.

thanks.
 

leo2kp

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Typically mini cases are not designed for high airflow, but for quiet operation. Add the heat of the CPU, HDD, and graphics card, I suspect that you need improved exhaust ventilation. What model case do you have?
 

mattius92

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Aug 27, 2010
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To be honest, the stock heatsink and thermal paste is hardly enough to keep the CPU cool. Also your case appears to have a low amount of fresh airflow if it only has a 80MM rear fan. I would suggest a front intake fan. If you can fit 120MM fans, go that way.

What case do you have?
 
There use to be a OLD poster here, SupremeLaw, how stated the intel should be sued for design defiencies for there HSF (dating back to the (my) E6400. Nothing has changed. The Intel HSF is barely addiquate for a Case with decent air flow and upto moderate CPU usage (percentage). The Intel HSF is at the Bottom of the performance totom pole and that is compounded by the problem of locking all four corners (and staying locked) of the push-pins.

My recommendation has always been - do NOT even remove the HSF from box, leave in box to weight it down (Have to have if you ever need to RMA the CPU, so Have to keep for 3 yrs - LOLs)

A 3rd party $30 HSF is MUCH better.

In your case:
1) Highly recommend a front and rear Fan as a Minimium.
2) Remove HSF (personally I'd recommend replacing) and Clean off the HS Coumpound (paste) using rubbing alcohol. But a tube of AS5 and re-apply. NOTE pea size blob in center and spread evenly. Re-attach the (UGH) Intel HSF making sure that the 4 push-pins are PROPERLY locked in place. Might want to google a video on "installing Intel's HSF".
 

chucklepie

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Jul 4, 2012
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10,510
Hello,
To answer some questions.
1. It's just the cpu with the temperature issue, SMART says low temperature as do the rest
2. I have a INWIN Z638 case (http://www.in-win.com.tw/products_pccase_series.php?cat_id=1&series_id=14&model_id=457)
3. cpu-z says 1605 speed with 16x multiplier and 100 bus speed
4. I have the BIOS setting to 'normal', i.e. not eco and not performance. Everything is out of the box asus bios settings
5. it's an 3.3 i5 2500 (not k)
6. I have a 6850 card with cx450 psu
7. I have a single Xilence Red Wing 80mm Quiet Fan at the back


btw, would this do a better job?
http://www.amazon.co.uk/gp/product/B005J2IS3U/ref=s9_simh_gw_p147_d1_i1?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=0F79FZ27QB4N4RW7PBJD&pf_rd_t=101&pf_rd_p=358549767&pf_rd_i=468294

It was the only one I saw that had a fan facing the same as my current one and could possibly fit (I don't know if a Cooler Master Hyper 212 EVO or something would fit, seems like a tight fit).
 

mattius92

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Aug 27, 2010
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Personally, I think you will be better off with a new case. That case only supports a single 80MM fan in the back of the case. I would recommend a 120MM intake and a 120MM exhaust as a minimum.

How much would you be willing to spend on a case?
 

chucklepie

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Jul 4, 2012
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I'd rather keep the case, I'll see if I can fit another fan in anyway as there's plenty room at the front.

Question regarding thermal paste. I read a site comparing all methods of application and it came out best with a single dot in the middle the size of a grain of sand and to avoid too much like a bean sized. But then somebody told me if you have a cpu with IHS (which is pretty much all nowadays) then it's the opposite, i.e. put on paste the size about a bean not a tiny dot. Is this right?
 

chucklepie

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Jul 4, 2012
11
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10,510
I'd rather keep the case, I'll see if I can fit another fan in first as there's plenty room at the front. If not, I'll look at another case.

Question regarding thermal paste. I read a site comparing all methods of application and it came out best with a single dot in the middle the size of a grain of sand and to avoid too much like a bean sized. But then somebody told me if you have a cpu with IHS (which is pretty much all nowadays) then it's the opposite, i.e. put on paste the size about a bean not a tiny dot. Is this right?
 
2 Types of HSFs - two different methods.
1) For smooth surface on the HSF. You need approx a Pea size amount can be applied either to the HS or the top of the CPU. Then spread evenly. Some use a plastic spreader such as one of the "blank" credit cards you get in the mail all the time, or use your finger (wear a latex glove). The key is do NOT use too much.

2) the 2nd method is for HSFs that have Heat pipes and little indented "valleys" such as the hyper 212's. For these types the best method is to apply some to the Bottom of the HS and spread so that only the Valleys are filled. Then a small amount (less than the pea, but more than a grain of sand). and spread very thinly on top of the HSF (as above). Note some use a "line" method" for this type of HSF. Google a video on "installing the Hyper 212 HSF". Personally I prefer my method.