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CPU + NB Overclock: Voltage stable, but temperature crashes. - Page 2

post #11 of 12
Quote:
Originally Posted by WildcatWhiz View Post
@Soggy: Thanks for that informative analysis. That's a lot to digest.

I'm still pretty perplexed...I know that the CPU overclock is stable at the current voltage withOUT the NB overclock. It's the NB overclock that I'm working on that's causing problems. I have it at 2700Mhz, and have tried everything from 1.25-1.35v. It seems like on 1.25v it runs for a while (over 30 mins), but crashes because of too little voltage. At 1.35v, it runs just about as long, but crashes when temps get to about 64C. I know 62C is the max specified by AMD, but I've read that these chips can go a little past that.

I'm trying to make my pump/radiator combo more efficient in the hopes that I'll lower the temps a bit more. I think if I can get the temps down a bit more, I can run it at a stable voltage (maybe 1.3 or so on the NB). I suppose I could drop the NB multiplier down a notch, but where would the fun be in that? I'm SO close!

I'll keep ya'll posted.
Do you still have the hs on the NB itself on the mobo? Could be that the TIM has started to fail and seperate from the chip causing some temp issues right on the nb.

Also, I have not looked at your build but some NB's on modern mobos have a heat pipe from the small NB to the mobo Vregs, (basically a channel for the little NB to a bigger sink somewhere closer to the typical placement of a comp exhaust 120mm) if you have completely submersed the heat pipe the pipe will temp soak and the evaporation process that should take place now no longer happens, and as such, any real cooling that was taking place, is now gone.

The stock HS on the amd with heat pipes suffer this issue as well, as the heat convects up the pipe, there is no cool spot for the coolant to condense back into a liquid and as such a big chunk of the thermal performance of the HS is lost, and boom, temps go up quick.
Yukikaze
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Yukikaze
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post #12 of 12
Thread Starter 
Quote:
Originally Posted by Soggysilicon View Post
Do you still have the hs on the NB itself on the mobo? Could be that the TIM has started to fail and seperate from the chip causing some temp issues right on the nb.

Also, I have not looked at your build but some NB's on modern mobos have a heat pipe from the small NB to the mobo Vregs, (basically a channel for the little NB to a bigger sink somewhere closer to the typical placement of a comp exhaust 120mm) if you have completely submersed the heat pipe the pipe will temp soak and the evaporation process that should take place now no longer happens, and as such, any real cooling that was taking place, is now gone.

The stock HS on the amd with heat pipes suffer this issue as well, as the heat convects up the pipe, there is no cool spot for the coolant to condense back into a liquid and as such a big chunk of the thermal performance of the HS is lost, and boom, temps go up quick.
I have this guy: http://www.newegg.com/Product/Produc...82E16813131633

I think temps are the issue. From what I've read, I should be able to get a stable NB clock of 2700Mhz at anywhere from 1.25v-1.40v depending on the clock of the CPU. It seems that after 1.35v or so, it stops scaling and simply adds more heat.

I would disagree with the previous poster who said that mineral oil is not very good at cooling. On air, with a Hyper 212+, I could get to 3.8Ghz CPU and about 2600Mhz NB at max temps. Now I am this close to getting 4.0Ghz stable with a 2700Mhz NB.

FWIW, I have about 8.5 gallons of mineral oil in my system, so it absorbs the heat pretty well. I have a small pump (300GPH) located directly above the CPU heatsink that delivers the hot oil out of the system, into a dual 120MM heatercore, and then back into the system directly below the CPU heatsitnk. My thought is that the hot oil will be "exhausted" from the CPU, chilled, and then re-introduced to the CPU.

The oil itself doesn't fluctuate that much. Under an hour of OCCT the oil clumbs maybe 5C-10C over ambient. Same thing with the other components (e.g. GPU and SSD). The problem is that the CPU heatsink can only transfer its heat to the oil so quickly. A faster pump might help. I think I've maxed out the cooling on the radiator. I might be able to add two more fans on the backside for a push-pull, but it wouldn't do very much I don't think.

Anywho, I'll continue the quest for lower temps. If I can't get it lower by the end of the week, I may consider dropping my CPU or NB multiplier back one notch.
    
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FX 8120 ASUS M4A89GTD PRO/USB3 890GX 2 x Asus 5770 CuCore 2 x 2GB Kingston HyperX 1800Mhz 
Hard DriveCoolingOSMonitor
64 GB Kingston V-Series Err, 10 Gallons of Mineral Oil and a Automotive... Windows 7 x64 SP1 24" Asus LCD 
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Razer BlackWidow Ultimate 600W Seasonic Aquarium with ~10 gallons of mineral oil Razer DeathAdder 
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Razer Kabuto 
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