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47717768 (banned)
join:2003-12-08
Birmingham, AL

47717768 (banned)

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CPU getting hot too fast when running prime95

I have AMD Phenom II X4 970 Black Edition CPU and 4GB of RAM in my build. Right after starting Blend test with Prime95 my CPU has reached the max temp in less than 2 minutes. Does it means my fans and CPU heat sink are up to no good?.

beerbum
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join:2000-05-06
behind you..

beerbum

Premium Member

no it just means the CPU is doing what it's supposed to do.

my i7 3770 goes from 40C to 60C in less than a second after starting Prime95.. and it's just as quick to drop back to 40 when the test is stopped.
47717768 (banned)
join:2003-12-08
Birmingham, AL

47717768 (banned)

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How about overheating that can be damaging to the CPU?. If you run it for a long time like 30min.
asdfdfdfdfdf
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When you say max temp what temp are you talking about?

Is it hitting this and stabilizing or does it continue to creep up beyond that?
bbear2
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join:2003-10-06
dot.earth

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Most modern CPUs have thermal protection in them in that they will slow down clock speeds before burning themselves out. Not sure if yours does, but you can check on AMD.com or on CPUWorld.com to be sure.

I would also double check the physical connection of your heatsink to the CPU. Did you use a proper amount of TIM? Too much and it can actually make your CPU run hotter than necessary. How careful were you when you fitted it all together?

Some other data points would be helpful too. Like how are the CPU temps under other conditions or is that Blend test the only on causing concern?
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47717768 (banned)
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Birmingham, AL

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Re: CPU getting hot too fast when running prime95

I have checked physical connections to every fan i have. As for CPU i have AMD Phenom II black 970 »products.amd.com/pages/d ··· upport=1
47717768

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the temp keeps clamming up without stabilizing.
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asdfdfdfdfdf
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Re: CPU getting hot too fast when running prime95

what is the highest temp you have seen in this situation?
47717768 (banned)
join:2003-12-08
Birmingham, AL

47717768 (banned)

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I have quit a stress test when the CPU temp has gotten up to 70C.

beerbum
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said by 47717768:

Does it means my fans and CPU heat sink are up to no good?

how exactly is the cpu being cooled?

does it have a heat sink with a fan or fans directly connected to the heat sink..?

or does it have just a heat sink only on the cpu with the case fan(s) blowing towards the heat sink?

if it's the latter I would suggest putting a direct cooled HSF on the cpu.
47717768 (banned)
join:2003-12-08
Birmingham, AL

47717768 (banned)

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Here is what i have.

Deepcool Gammaxx 300 heat sink »www.hardwaresecrets.com/ ··· iew/1558
As for case fans i have x2 80mm Masscool case fans. »www.newegg.com/Product/P ··· 35150007
asdfdfdfdfdf
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Did you use the stock thermal interface material that came preapplied to the heat sink?

CovMac
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join:2000-11-06
Covington, LA

CovMac

Premium Member

said by asdfdfdfdfdf:

Did you use the stock thermal interface material that came preapplied to the heat sink?

Good catch! From the review:

"On the base of the Gammaxx 300, the heatpipes are exposed in order to make direct contact with the CPU. This cooler comes with a layer of thermal compound pre-applied on the base. However, in this particular sample, it seems like the plastic cover that protects the base moved during transportation, and some compound was wiped off by the inner side of the box. First, we tested the cooler with its pre-applied thermal compound, which was partially removed. The performance was very poor. We then removed the stock compound, applied some Arctic Silver 5 compound, and retested. The cooler achieved better results, so those were the data we used on our comparison."

Sounds like Oleg needs to remove the HSF, remove the paste from the base of the HSF and the top of the CPU, and apply AS5.
asdfdfdfdfdf
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asdfdfdfdfdf

Premium Member

"Sounds like Oleg needs to remove the HSF, remove the paste from the base of the HSF and the top of the CPU, and apply AS5."

If the stock thermal material was used I would agree this needs to be done if he wants to worry about it. 70 C and rising is an issue.

Since the normal usage temps reported in another thread weren't really a problem another option would be to simply not worry about what is happening in prime95, as this isn't representative of a normal usage pattern. If temps are approaching 70C in normal usage then I would first remove the material that came on the cooler and apply a decent quality thermal material such as arctic silver 5.
If it was me I wouldn't be worrying about prime95 but would only worry if temps were getting above 60-65C when I'm actually doing something I want to do with the machine, such as gaming.
47717768 (banned)
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Birmingham, AL

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No. Have not done it yet. What i may do is i will buy 120mm case fan.
asdfdfdfdfdf
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If your case has 80mm fans then you can't just replace them with 120mm fans. The fan grill/vent openings as well as screw points are designed for 80mm. Putting a larger fan there if there isn't 120mm worth of grill opening space would be counterproductive.

Based on what you have said I don't think a case fan is going to help anyway. Unless your case temps are abnormally hot I wouldn't spend any money doing that.
I would just monitor my temps while doing the things I normally do. If they start exceeding 65C then I think you need to reapply thermal material as described above. Other things aren't going to allow you to avoid this. If your temps aren't getting that high in normal usage then I would not worry so much about it. I think you are tormenting yourself over something you probably don't need to be worrying about.

What specific case do you have?
bbear2
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dot.earth

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Any case fan is pretty much irrelevant in this situation. Keep the case open during your testing and prove it for yourself if you wish. We assume your cooler is dust free and working well. Might want to reread my original suggestion 5 down from the top

DarkLogix
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Baytown, TX

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said by 47717768:

No. Have not done it yet. What i may do is i will buy 120mm case fan.

Also are the fans being controlled or at full all the time?
also are you just using the 1 fan it came with or did you add a 2nd to do push/pull?
HeavyHemi
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May I suggest you take advantage of this resource to determine more accurately if you actually have a temperature issue: »www.overclock.net/t/1128 ··· nd-guide