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Vega's Quad-SLI 3GB GTX580 sub-zero liquid cooled build - Page 38

post #371 of 546
Vega what kind of oc are u getting out of the cards for now using stock volts.
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post #372 of 546
subbed.
post #373 of 546
Quote:
Originally Posted by CallsignVega View Post
With these temperatures how high do you think I can take the voltage without damaging the GPUs?
With Nvidia's lacking VRMs, it tends to be more about VRM quality even if temps are low. Not sure how many phases the 3GB 580 has but reference 580s should stay under 1.15V if I'm not mistaken. EVGA's Fan Unlocker opens it up to 1.15V so I'm assuming they feel it's safe to use 1.15V. MSI's 16-Phase 580 Lightning can handle 1.3V.

Most 580s seem to hit a wall around 1000 so you probably don't even need to go up to 1.15V anyways. You might already be near your max with 1020. http://hwbot.org/hardware/videocard/...0?tab=rankings
Edited by PoopaScoopa - 4/12/11 at 6:37pm
post #374 of 546
Let's see some benches at 1.15V!
    
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post #375 of 546
Quote:
Originally Posted by CallsignVega View Post
With these temperatures how high do you think I can take the voltage without damaging the GPUs?
GPU should be fine to around 1.2V.
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post #376 of 546
Quote:
Originally Posted by xxbassplayerxx View Post
GPU should be fine to around 1.2V.
I had my 470 at 1.212 for over a year folding and havent had any issues with it at all and I'm only running regular water cooling.
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post #377 of 546
Quote:
Originally Posted by VW_TDI_02 View Post
I had my 470 at 1.212 for over a year folding and havent had any issues with it at all and I'm only running regular water cooling.
Yeah me too, I was just going to unlock the BIOS to the max (1.2125V). I could also give him an unlocked AB if he wanted to give more (~1.3V).

Depends if he's willing to do some bointing for the team
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post #378 of 546
Quote:
Originally Posted by xxbassplayerxx View Post
Yeah me too, I was just going to unlock the BIOS to the max (1.2125V). I could also give him an unlocked AB if he wanted to give more (~1.3V).

Depends if he's willing to do some bointing for the team
The guide in my sig will let anyone unlock their Fermi to 1.212V themselves but I thought that even if Afterburner lets you select an even higher voltage setting, it still won't stick when you press apply. Plus 1.3V will kill the card faster than you can say Toasted Fermis. I'm pretty sure it doesn't have 12 VRMs like the lightning.
post #379 of 546
Quote:
Originally Posted by PoopaScoopa View Post
The guide in my sig will let anyone unlock their Fermi to 1.212V themselves but I thought that even if Afterburner lets you select an even higher voltage setting, it still won't stick when you press apply. Plus 1.3V will kill the card faster than you can say Toasted Fermis. I'm pretty sure it doesn't have 12 VRMs like the lightning.
If you have the correct card (reference 580 or lightning), the correct BIOS, and the correct version of unlocked AB (or Smart Doctor), you can apply as much voltage as your heart desires.

And no, 1.3V won't kill it that quickly. While it might shorten the death, it would take ~1.55V-1.65V (well beyond clock scaling) to instakill the card. The standard VRM setup has demonstrated that it can take at least 1.4V from various benchmarkers.

Clocks only scale with more voltage given appropriate temperatures. 1.2V on my 570 (before it kicked the bucket) was good for 975 core at room temperature. More voltage wouldn't help. However, at -40C, 1.25V was good for 1100 core. My point in saying this is that he won't reach dangerous voltages (~1.35V) at his temperatures because the card will quit scaling. Unless he drops the temperatures even more, I'd be surprised if he reached scaling beyond 1.25V.
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post #380 of 546
Thread Starter 
The Palit/Gainward uses its own 6+2 VRM design. Not sure of the quality/capacity as that is beyond my scope of knowledge. Maybe someone else could chime in:



I could try 1.2V to see if I get any tangible benefits to the over clock.
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