Subzero overclock help

[the_spankles]

My friend and i built a subzero cooling system out of an old AC unit (inspired by Linus's "Chilling Threadripper" video. The cooling unit is functioning beautifully (subzero idle temps), so we are attempting to overclock it. We are using an FX 8350 and a Gigabyte 990fx chipset motherboard. We were stable at 4.8ghz with 1.4725V. We set the CPU Frequency to 5ghz and began gradually increasing voltage until we were stable on Aida64 for 60 minutes at 5ghz 1.525V, but cinebench crashes instantly upon clicking run. We gradually increased the voltage to 1.565 with no change in the cinebench crashes. Both me and my friend are inexperienced overclockers and have little insight  into the meanings of many settings in the bios, we would appreciate any pointers or general tips on the subject of overclocking. Below are pictures of my bios settings, the desktop picture is of when we were running aida64 and it was stable, the system only crashes on cinebench.

[BobVonBob]

I believe you're starting to reach the limits of your chip. Voltage curves are usually exponential.

 

5 GHz is starting to get into the "not actually stable" stable range of average FX chips, where any unusual load will break something. Cinebench loads the processor differently than Aida does. Your board or PSU also just might not have the power delivery chops to go that high. It's probably using more than 200, even 250 watts at this point.

[Firewrath9]

1 minute ago, BobVonBob said:

I believe you're starting to reach the limits of your chip. Voltage curves are usually exponential.

 

5 GHz is starting to get into the "not actually stable" stable range of average FX chips, where any unusual load will break something.

9590 says hi! 5ghz, 220W

 

i think its motherboard vrm throttleing, is the heatsink for vrm extremely hot to the touch?

[BobVonBob]

1 minute ago, Firewrath9 said:

9590 says hi! 5ghz, 220W

 

i think its motherboard vrm throttleing, is the heatsink for vrm extremely hot to the touch?

That, but those were very well binned and didn't really go much higher. I edited the first one to include mentions of VRM.

[the_spankles]

5 minutes ago, Firewrath9 said:

9590 says hi! 5ghz, 220W

 

i think its motherboard vrm throttleing, is the heatsink for vrm extremely hot to the touch?

The whole thing is submerged in mineral oil, which should be absorbing the heat. The vrm feels slightly above ambient temps..

[Zando_]

Could defo be the PSU/VRMs not having the chops to feed the CPU properly.

 

Also ooooo I should eventually look into this someday, my X58 mobos can apparently feed about 600W to the CPU and I have the PSU to drive that power consumption...

[the_spankles]

I am currently using an EVGA 400w psu, I have an EVGA 650 gold psu in my PC. Should I use that one instead?

 

1 hour ago, Firewrath9 said:

9590 says hi! 5ghz, 220W

i think its motherboard vrm throttleing, is the heatsink for vrm extremely hot to the touch?

My VRM is not hot. The whole mobo is in mineral oil, which is being passively cooled. I touch the VRM and its slightly above room temp.

[Firewrath9]

14 hours ago, BobVonBob said:

That, but those were very well binned and didn't really go much higher. I edited the first one to include mentions of VRM.

the 9590 is a big meme, it has 270W power draw stock.

[BobVonBob]

Just now, Firewrath9 said:

the 9590 is a big meme, it has 270W power draw stock.

 

Just now, Firewrath9 said:

it has 270W power draw stock

 

2 minutes ago, Firewrath9 said:

big meme

I knew it was insane, but I didn't actually realize it was that insane. That's 20W more than stock 2990WX. 

[Firewrath9]

14 hours ago, the_spankles said:

I am currently using an EVGA 400w psu, I have an EVGA 650 gold psu in my PC. Should I use that one instead?

  

My VRM is not hot. The whole mobo is in mineral oil, which is being passively cooled. I touch the VRM and its slightly above room temp.

I think its a PSU issue. 400W when the cpu can draw 300 easily.

[Firewrath9]

6 minutes ago, BobVonBob said:

 

 

I knew it was insane, but I didn't actually realize it was that insane. That's 20W more than stock 2990WX. 

 

ahh, 200 more watts than a i7-4770k, and thats only on OCCT. Put that on AIDA64 w/ CPU & FPU, that can easily surpass 400W, and thats with a binned 8350. a regular 8350 must require even higher voltages, and I'm not suprised if it trips OCP on the 400W psu.

 

OP: I'd reccommend at least a 650W psu for just CPU, but if you are going with GPU aswell, then a 1000W+ psu is necessary. (find used mining PSUs, they should work fine)

 

Remeber the time of the 295x2? ahh 500W TDP with just a pair of 8 pins.

put two of of those, with a 9590, and OC, easily will trip your home breakers (15A @ 120V aka 1800W)