AMD-FX8350 Prime95 Temps (updated)

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ayebee

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Another question, when using prime95 - I see my CPU temp get to 60c before I stop it due to nervousness. It doesn't seem to take too long to get it to this temp. Is it a normal occurrence due to the purpose of the software or is there something I should change in my OC settings to ensure it doesn't quickly rise to this temp?

Currently using:

AMD-FX8350 @ 4.62ghz
(1.40v - 230 bus speed)
Asus Sabertooth 990FX R2.0 ATX AM3+
Corsair H80i
G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600
Corsair 750W ATX12V
 
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ayebee

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See above, I was updating the thread when you posted. This seems to be, so far, the most helpful/fastest response forum I've ever been apart of :ange:
 
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I can only give you my experiences with recently overclocking in almost the exact same config as yours and that is - Gawd damn the 8350 runs hot.

It's pot luck to getting a good chip, but in my case, 20-30 minutes of Prime95 puts my die temp right up there to about 58c, giving me a little bit of headroom to the 62c limit. I imagine it will go safely up to 70c, at which point it will begin throttling, but I'll stay on the safe side.

This is with a relatively minor 4.4GHz overclock on the same cooler. Admittedly I replaced the stock fans with two SP120 Quiets and it is also summer, but that's about as far as I can go on mine.
It was also done with a slightly minor voltage bump, remaining at a fixed volts of the stock 1.3625v and the CPU LLC set to Ultra High, which, in both cases (Normal and Load) over shoots the mark by about 0.02. I had Prime errors when it was undershooting, so I'm more than ok with that slight addition.
(Under full load, that'll be 1.38v).

Your voltage is a bit higher. Your clock is higher. Although, you are also combining it with an FSB overclock.
Interesting note is that during my testing at stock levels to get an idea about how things looked, when TurboCore was used it auto over-volted to 1.4v, suggesting that AMD greatly over compensated for the tiny .2GHz increase with the Turbo. This suggests that it will run at comparative temps at simply stock volts (with TurboCore, fortunately, you disable it for an OC).

In short then, you may need to clock down a bit. It's getting too warm.
I believe in another thread you also noted that you used Arctic Silver 5 for the paste. Don't forget the break-in period for this TIM (100-200 Hours), I'm also using AS5. It's unlikely you'll see a drop of anything more than 1-2c after that, if any, but it's worth remembering.
 
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ayebee

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Much appreciated - I just dialed the OC back a bit, putting the bus speed at 225 and the voltage to 1.39375 (previous 230 bus speed and 1.4000v was unstable). I am running AMD OverDrive Stability test right now. So far with a clock at 4.51ghz I am at 100% load and only at 49c (or so HWmonitor says).

The interesting thing to note is when I do a stability test with AMD OverDrive using previous 4.62 settings and bios config it said I was only getting to about 55c core temp. I'm wondering if Prime95 is doing something wrong or harmful in relation to some config setting and AMD OverDrive is just a better tool to be using in this current scenario.

Do other people complain about Prime95 putting their CPUs at an excessive temp compared to other stability testers?
 
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It does.
AMD OverDrive has a pretty weak stability test. I generally notice about 8-10c more in Prime95 in the same time period.
Stress Tests are designed for that purpose though. I doubt you'd ever manage to get to the same heat under normal gaming conditions. They're designed to really run things at their limit.

I suppose AMD decided they didn't want to 'officially' provide a tool to cook their chips. I'm sure the lawsuits would be immense.

I still like OverDrive though, it's a handy piece of software. You can use the Thermal Margin to get ever so slightly more accurate die-temps than what the other programs show. It has an extra decimal.
Keep in mind that the Thermal Margin displays how far away you are from 70c, rather than the current temperature.

AMD states that it's "Perfectly safe to operate within the thermal margin" and yet on the contrary states a 62c safe limit.

As far as other software goes, I can't say as I've personally tried them outside of those two. I hear Intel Burn Test is the most aggressive and OCCT being about the same as Prime95, but I could be wrong.
Honestly though if it survives Prime I'm sure things are going to be ok from there on.
 
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ayebee

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Good to know, and thanks. I just dialed back a little more for the CPU volts - Set at 225 for bus speed and 1.38 for volts. Previous 225 and 1.39375 caused instability. Just ran Prime95 stress test and ran it for about 15 minutes - results were: 57c core temp, stable thus far.

Will continue to monitor to ensure stability. I'm hoping I've found the right combination of settings as I don't much want to drop below 4.51ghz. I will update when I have more information.
 
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ayebee

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Update - Completed Prime95 stress test and AMD OverDrive stress test. 4.51ghz with 1.38v and 225 bus speed. Appears very stable and CPU is insanely cool.

AMD OverDrive produced only a 52c temp and Prime95 produced 57c after about 30 minutes of staying at that temp, so I stopped it.
 
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