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post #41 of 125
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Originally Posted by Arizonian View Post

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So what numbers are you guys actually hitting for OC's? I'm a little upset as I get driver crashes running 3dmark11 at 135 or higher. I run the test at +132% Power Target, +134 GPU Clock, +500 Mem Clock. Going above 135 ends up crashing the driver, and going to 520 on mem gives artifacts and eventually crashes. So this is the max I've gotten. And with my fan curve, the GPU temp never goes above 67 even while stress testing...

For everyday gaming I set it to 132%/+130/+400.

When you game do you have GPU-Z up? If you monitor your stats after gaming, look at the 'max ' core clock. Mine after Crysis hit 1205 MHz and my OC was +132/+110/+275. It over clocked itself higher when needed.

Yeah I hit around 1280-something. I scored a 17050 in sli on a 2600k with 8x/8x sli but I remember the pre-launch benchmarks showed higher oc capabilities on these cards.

That's actually good for a card with voltage limits.

The 7970 has a voltage limiter as well but they have a hack to unlock it. Most avg core OC is 1150-1175 for them without unlock. Not bad coming from a 925 MHz Core.

I think the 680 has less of an OC head room from stock 1006 MHz defualt set higher but it's all relevant to both top clocks anyway.
     
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post #42 of 125
Thread Starter 
1256 looking like my stable topend, 1230 without max fan.

These things are gonna beast under water, autofan usually crashes at 70C if i oc too high. But i can hold at like 68 C if i stay below 1250 smile.gif
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post #43 of 125
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1256 looking like my stable topend, 1230 without max fan.

These things are gonna beast under water, autofan usually crashes at 70C if i oc too high. But i can hold at like 68 C if i stay below 1250 smile.gif

So water can help for these cards? I was beginning to think it was pointless.
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post #44 of 125
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Maybe not as effective as on other GPUs where you can actually bump the voltage above the max, which we can't really do yet. But these things are pretty thermally sensitive at 1.175V for me. Like I said, at that voltage I can do about 1230~ with auto fan(crash at 70-72'C ish if higher) and 1256 with max fan(holds around 56'C).

Whether or not the card could handle higher with the same voltage is another issue, but thermally I'd reckon I could do 1300+ if I could keep temps under 50'C.
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post #45 of 125
Seems like 28nm gpus in general are pretty heat sensitive. 70c is the number I find I have to keep 7970s under when at ~1200. 7970s also don't respond well to additional voltage above 1.2v, could be the same for the 680s.

Is there a way to disable the turbo boost or is that kind of just a core feature?
Edited by Tslm - 4/12/12 at 3:44pm
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post #46 of 125
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Originally Posted by Tslm View Post

Seems like 28nm gpus in general are pretty heat sensitive. 70c is the number I find I have to keep 7970s under when at ~1200. 7970s also don't respond well to additional voltage above 1.2v, could be the same for the 680s.

Is there a way to disable the turbo boost or is that kind of just a core feature?

No way to disable voltage like an unofficial hack like the 7970 or turn off turbo boost. Turbo Boost is what over clocks itself to max 1.175v.

I had only a couple hours with it since I just revived it last night.

I got 1250 MHz core clock on BF3 last night with my 680SC.

Preliminary 3DMark11 score 9617.

Hevean Bench (Extreme Tess, 16x, 8x AA 1920x1080 -maxed settings) 50.7 FPS.

Only on second official drivers thus far. At the moment we are limited to 85% fan speed. When EVGA comes out with the BIOS Fan Unlocker and we can push 100% fan speed it will be easier to keep cool and will score higher core clocks.
     
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post #47 of 125
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Originally Posted by Arizonian View Post

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Originally Posted by Tslm View Post

Seems like 28nm gpus in general are pretty heat sensitive. 70c is the number I find I have to keep 7970s under when at ~1200. 7970s also don't respond well to additional voltage above 1.2v, could be the same for the 680s.

Is there a way to disable the turbo boost or is that kind of just a core feature?

No way to disable voltage like an unofficial hack like the 7970 or turn off turbo boost. Turbo Boost is what over clocks itself to max 1.175v.

I had only a couple hours with it since I just revived it last night.


I got 1250 MHz core clock on BF3 last night with my 680SC.

Preliminary 3DMark11 score if 9617.

Hevean Bench (Extreme Tess, 16x, 8x AA 1920x1080 -maxed settings) 50.7 FPS.

Only on second official drivers thus far. At the moment we are limited to 85% fan speed. When EVGA comes out with the BIOS Fan Unlocker and we can push 100% fan speed it will be easier to keep cool and will score higher core clocks.

I keep reading this but if water doesn't help it OC why is 15% more fan?
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post #48 of 125
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Originally Posted by lightsout View Post

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Originally Posted by Arizonian View Post

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Originally Posted by Tslm View Post

Seems like 28nm gpus in general are pretty heat sensitive. 70c is the number I find I have to keep 7970s under when at ~1200. 7970s also don't respond well to additional voltage above 1.2v, could be the same for the 680s.

Is there a way to disable the turbo boost or is that kind of just a core feature?

No way to disable voltage like an unofficial hack like the 7970 or turn off turbo boost. Turbo Boost is what over clocks itself to max 1.175v.

I had only a couple hours with it since I just revived it last night.


I got 1250 MHz core clock on BF3 last night with my 680SC.

Preliminary 3DMark11 score if 9617.

Hevean Bench (Extreme Tess, 16x, 8x AA 1920x1080 -maxed settings) 50.7 FPS.

Only on second official drivers thus far. At the moment we are limited to 85% fan speed. When EVGA comes out with the BIOS Fan Unlocker and we can push 100% fan speed it will be easier to keep cool and will score higher core clocks.

I keep reading this but if water doesn't help it OC why is 15% more fan?

Higher fan speed keeps temperatures down therefore you can go for a higher overclock without exceeding 70°C on the GPU. You'll be able to obtain a higher Core clock, get higher benchmarks and results in higher gaming FPS.

Does this make sense? More fan speed to keep the GPU cooler? Resulting in higher over clocks.

Water does help but not as much as it used to in previous versions. It's not worth it as much as before.
     
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post #49 of 125
Just to be clear, what your saying is that keeping it below 70C does help, but keeping it below 50C with water won't help more?
post #50 of 125
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Originally Posted by CMDPromptX View Post

Just to be clear, what your saying is that keeping it below 70C does help, but keeping it below 50C with water won't help more?

I've never had a video card underwater. I do know that you can only go so far with the voltage increase on these cards therefore it doesn't make much difference until more voltage can be added. You'll eventually hit a ceiling with the core clock.

I also have seen that the 7970 video cards even with greater voltage has their limits and being underwater doesn't increase performance once the voltage barrier is hit with the new 28nm fabrication cards. It just dosent respond well to voltage after a certain point like prior series.

I'll take the extra 15% fan increas even for 20 MHz on the core.

Correct me if I'm wrong but under water the 7970's are only getting approx 100 MHz higher or so of a bump even with extra voltage. Even if temps are way below norm.

I'm hitting 69C before I go unstable and crash. 15% fan speed will get a slight OC but not near where it's ineffective. Those of us on air don't come close to it.
     
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