Undervolting Stock FX-8350 to lower temps

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Ctwodub

Ctwodub

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I recently have been having some issues with my CPU temps on my FX-8350. I was baffled by my high temps since I am using an aftermarket cooler (212 EVO) and am not running high stress programs. I mainly am playing games, so I was shocked when my temps were causing my system to BSOD or freeze. I played with the fans a little bit and got the temps to an acceptable range while on BF4 (50-55c).

I know that the stock voltage on 8350's seems high (1.35v). My question is... would lowering the voltage bring my temps down enough to make it worth the trouble? From what I have read, the stock voltage on 8350's is higher than necessary.

Any ideas on what a stable undervolt (stock clock) could be? Or what increments to go down by to find the stable undervolt?

I also have read some stuff about VDroop. I am not exactly sure what setting the llc would or should be to account for this.

My system should be in my signature.

Thanks!
 
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Well, the FX series are overvolted out of the box to assure system stability (aka, so your CPU doesn't throw computing errors). Some have a lot of voltage on them and some have less, stock FX 8350 VCore ranges anywhere from 1.315 to 1.392V depending on chip binning.

Anyway, my guess is you should be able to lower the VCore to the 1.2V range, somewhere along the lines of 1.225-1.275V. Could be lower or higher as well, it basically depends on the chip, I have my 8320 at 4.2GHz undervolted to 1.280V while I've seen guys that can't even undervolt on 3.5 cause the CPU starts throwing errors in Prime95.

Though if I were you, I'd be more worried about reaching into 50s and 60s with your cooler than I would be about the CPU voltage, that's...
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WerneHR

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Well, the FX series are overvolted out of the box to assure system stability (aka, so your CPU doesn't throw computing errors). Some have a lot of voltage on them and some have less, stock FX 8350 VCore ranges anywhere from 1.315 to 1.392V depending on chip binning.

Anyway, my guess is you should be able to lower the VCore to the 1.2V range, somewhere along the lines of 1.225-1.275V. Could be lower or higher as well, it basically depends on the chip, I have my 8320 at 4.2GHz undervolted to 1.280V while I've seen guys that can't even undervolt on 3.5 cause the CPU starts throwing errors in Prime95.

Though if I were you, I'd be more worried about reaching into 50s and 60s with your cooler than I would be about the CPU voltage, that's the type of temperature I'd expect from a stock cooler but not a 212 EVO. If you can, check how the cooler is mounted, take the heatsink off and check is the thermal paste spread out evenly across the IHS/cooler base. Before that, check if your fan spins up to high RPM once your CPU hits 50C, on a well set up system the fan should spin at around 90% speed once the CPU reaches around 50C (as example, on a 2000RPM fan that would be ~1800RPM).
 
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Shain Taylor

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I'm sure it isn't mounted properly, or poor thermal paste/fan setup.. I am currently using a hyper 212 evo with my 8350 and am getting 4.5GHz stable with 1.344 volts... re-install the cooler, make sure everything is tight and stick another fan on the evo so it is running in push/pull, that saved around 8'c for me.. and if that doesn't work then you may have a bad chip...
 
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Shain Taylor

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That would be true... on the stock cooler... drop the voltage bit by bit until you reach a mode date temperature that suits your needs but make sure that you stress test it for at least 40 minutes on prime 95 blend mode..
 
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Ctwodub

Ctwodub

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THought I should follow up and let you guys know what happened. I re-seated the cooler (very carefully this time) and now I am not breaking 37c in HWMonitor and CoreTemp under full load in prime95!

http://postimg.org/image/5nndvqxi9/

Thanks for the suggestions guys!
 
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Ctwodub

Ctwodub

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I did it the same way as before, but made sure to clean EVERY bit of old paste off with alcohol. Other than that, I was less liberal as to how much paste I put on. I must have had too much paste on before and it could have had old paste residue.

I guess "The Devil is in the details" is a saying for a reason, so I learned.

I'll be setting up a push/pull config soon so that would be cool if I could get temps down even further and maybe give OC'ing it a go.
 
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keimo999

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spread method isn't the best one to use for most pastes, it might leave air bubbles, bea method is the way to go, atleast in my my experience. I lost 10c on Prime95

+ i recomend undervolting if you like to have even cooler/queter system
 
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