FX8350 Prime95 Test

javathedot · Aug 2, 2013

At stock speed (or even turbo mode) the 8350 maxes at 54c temp using custom Prime95 Test maxing all cores and memory. Pretty safe and good.

However, When I tried testing again on OC settings (4.4 to 4.5Ghz) the temp kept on increasing beyond the limit.

I also tried maxing only 4 cores but the same thing happened although it took more time reaching the temp limit.

I'm using Noctua D-14. No Test Errors reported by Prime95 on OC setting.

I just want to know if this should really happen. Thanks in advance.

dudewitbow · Aug 2, 2013

if temperature is increasing too much, then theres too much voltage being introduced to the cpu, or bad heatsink contact

javathedot · Aug 2, 2013

I forgot to mention I manually set cpu voltage to 1.45 and actual CPU-Z reading ranges from 1.404 to 1.452. I'll try to limit the voltage at 1.39 or 1.4.

Azrael47 · Aug 2, 2013

Set the volt to 1.3 Then record your CPU temperatures with third party software such as HWMOnitor or Core Temp.

javathedot · Aug 2, 2013

Noted. I'm using Asus ThermalRadar. I'll try HWMonitor and Core Temp for comparison.

The reason I set the voltage at 1.45 is because at stock speed (with turbo core) the voltage maxes at 1.386.

So I assumed there will be instability if I set the voltage lower than 1.386 at OC setting.

Azrael47 · Aug 2, 2013

You want to keep your CPU temps in a Prime95 test under 75

randomizer · Aug 2, 2013

javathedot :

Don't assume, test. That's why you're running Prime95 anyway

javathedot · Aug 2, 2013

randomizer :

So you mean at stock speed with all mobo settings on Auto, the reading of 1.386V at 4.1Ghz is over-voltage so I should not base my OC settings on that?

randomizer · Aug 3, 2013

Stock voltages are normally a bit higher than absolutely required. It would be expensive to bring it down as low as physically possible because testing would need to be more rigorous. Regardless of that, there's no reason to assume that your chip requires more voltage when you have the ability to test it. It's quite likely that it does, but even if it does it may not need as much as you're giving it.

javathedot · Aug 3, 2013

OK. I just did another test.

OC at 4.5Ghz (multiplier = 21.5, BUS = 210)

This time I let the motherboard control the CPU voltage = Auto.

Test: Prime95 - Custom, 8 cores, 12gb RAM

Results:
-Max voltage: Range 1.298 - 1.32, avg. 1.308 (Asus CPU-Z)
-3 cores Shutdown after 30 secs: core 5, 7, 8
-5 other cores @ 100%
-Memory reduced to 9gb after 30 seconds
-Max temp: 54c (stayed at that level) - Asus Thermal Radar
-No errors reported
-Total elapsed time: 5 mins. (will test longer next time for finer testing. For now the test is safe enough for gaming.)

So these results are pretty much self explanatory. I'm just gonna leave the mobo to control the voltage for now until I decide to push for higher frequency and the instability occurs.

All of you guys are right but I have to choose one for the solution.

Thank you very much everyone. I appreciate all your help.

TitanEntity · Jul 29, 2014

Try to increase just your cpu multiplier, try 22.5 and set your cpu voltage to 1.44 or 1.45

bmacsys · Jul 29, 2014

javathedot :

Hope you have a stout mobo with 8+2 phase voltage delivery.

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