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OC tips on Watercooled 6990 - Page 3

post #21 of 27
Sign of instability; artifacts, crashes and BSODs. Stress tests I normally use, OCCT, Furmark, Vantage, 3DMark 11, Heaven 2.5 and running few real games.

Since I never used Afterburner to OC, I use GPU-Z for each core.
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ケンジ
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post #22 of 27
Quote:
Originally Posted by Ken1649;15185372 
You got it. I think you are fine at 1000/1375-1400, see if you can find the lowest possible voltage to maintain stability at that clocks.

Few things that might seemingly cause insatbility @1000/1375:

1. Afterburner inteferes with ULPS and clocks throttling down?
2. Vreg/core temperatures (monitor with GPU-Z for each core)?
3. PSU +12v drops (use hardware monitor the +12v during test)?
4. The card is throttling down to stay within power draw limit?

Monitor with other display during test, if any of the above is causing instability that will make you think the ability of the core/memory to sustain at said clocks. Also, find lowest possible voltage. If you want to take it higher after 990, take a baby step of 5 MHz.

Other than GPU core/memory, higher stable CPU and RAM bandwidth will keep overall result in balance (for X58 chipset, don't have first hand experience with SB LGA1155).

OP, you're well suited following the direction provided by Ken.

There seems to be a point, TitaniumOverclocker, you haven't acknowledged and/or overlooked, at least judging from your responses, thus I'll reiterate it here: put some effort into tuning your frequency with the LOWEST VOLTAGE POSSIBLE. Running 1.25 volts for 990 core clocks seems high. Excessive voltage can be an influencing factor of instability, too, and also strains the PSU as well as the VRMs. Secondary consequence of heat should also be considered... and if you simply can't achieve those clocks at a lower voltage? If that's the case, great, you aren't going to wreck your card running those volts. The benefits from achieving that frequency at a lower voltage certainly justify the minuscule cost of tweak & testing for it, though. Since you are on air, tuning is all the more important, as 990 on the core with a substantial boost of voltage beyond default will provoke a fat increase in power usage. Altough nobody has otherwise recommended it, I would leave your AUSUM switch off (to keep the powertune safety in effect). Or, perhaps, a better option would be to use the AUSUM bios & dropping the Powertune slider to +10%. As long as you're limited to the stock HSF (& cranking 450 or 500 watts), let the intuitive function keep your 6990 in a safe range of operation. Better safe than.. your mosfets.
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post #23 of 27
On air, you will probably always crash with those voltage and clocks. Too much heat, no matter what you will do.

Wait for your watercooling things before playing with a high voltage like that. No need to risk your card for no reason.

Patience my yong padawan... Patience...
    
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post #24 of 27
Thread Starter 
the last two of you who posted

did you even read any of my OP, or even bother to look at my sig rig? I clearly state its watercooled.


And I said I wouldn't have time to do any tweaking until Wednesday, today... I'm gonna work on stress testing and lowering voltage for stability
 
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post #25 of 27
Note: Make a backup of a good working OS. The reason to take a small 5MHz increase, should it crash, it won't crash hard such as BSODs which might corrupt the Windows. Avoid BSODs if all possible, artifacts is a good sign of instability
ケンジ
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120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
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ケンジ
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post #26 of 27
Thread Starter 
Good call, I just reformatted too... I don't want to corrupt my windows again :S
 
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post #27 of 27
I had it to 1Ghz with 1.25v and it crashed after 10 mins of BF3. Right now i am testing 950Nhz with 1.175v. Heat is not really a problem. Even with increased voltage both cores are still under 50C
Ishimura
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Ishimura
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