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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 90

post #891 of 38701
Just got my sapphire in wheee.gif
this is on stock volts:
470
AAAAAAAAAAAAAAAAAAAAAAAAAWWWWWWWWWWWWWWWWWWWW YEAH!!
post #892 of 38701
Quote:
Originally Posted by slice259 View Post

Well with HardOCP test's, 335mhz was a gain of 12.5 FPS in BF3. So a reference card at 1260mhz vs say a lightning at 1350mhz is a difference of ( 54.6FPS @ 1260 mhz ) and (58.5 @ 1350mhz) So a gain of 3.9 FPS.
http://hardocp.com/article/2012/01/09/amd_radeon_hd_7970_overclocking_performance_review/5

Very few are getting a stable card at anything over what the ccc slider will allow 1125mhz. Most are getting a very unstable card anything over that. In fact there a good portion of cards that start to struggle with artifacts/shut downs etc at 1050-1100. Its just the luck of the draw I guess. I think it has as much to do with there cpu psu as the card though. I've seen much higher stable clocks with the x79 chipset. I'd rather spend the extra coin and get a cooler stable card at 1300mhz with zero issues that has the headroom to approach even higher clocks on air. To be honest I might say screw it and buy two 7990's in march if it takes that long for the lightning to come out.
Edited by rcfc89 - 1/16/12 at 1:09pm
 
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post #893 of 38701
Quote:
Originally Posted by rcfc89 View Post

Very few are getting a stable card at anything over what the ccc slider will allow 1125mhz. Most are getting a very unstable card anything over that. In fact there a good portion of cards that start to struggle with artifacts/shut downs etc at 1050-1100. Its just the luck of the draw I guess. I'd rather spend an extra coin and get a cooler stable card at 1300mhz with zero issues that has the headroom to approach even higher clocks on air.

I have been reading quite the opposite smile.gif. I just read through a bunch of pages on HardOCP forums and almost every single member that has a 7970 is able to achieve 1200-1250 on the core. Its in the fan rpm, and volts thumb.gif. Overall I was told 2 years ago that 5850s where SUPER load, and that 850mhz was the tiping point. Turns out the fan was never bad at all and I am running 1000 mhz core for over a year and a half. Regardless I know what OEM cards are capable of. Most if not all the overclocks I have seen on OCN have been people with the fans down around 40-50%. Ill be using 70%+ smile.gif. Overall have fun with your 3930k and whatever gpu you buy, sounds like a nice build.
post #894 of 38701
its not all about fan speed mate....

My MSI card sees artefacts at anything over 1070mhz core no matter what voltage or fan speed.

To be honest though the gains are pretty minor above this so I am happy with the over clock smile.gif
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post #895 of 38701
It appears that I can get a stable 1200 core/1575 mem OC at 1.225v when my fan profile is set 1:1 (meaning, the fan % changes at the same rate as the temperature). Been able to play BF3 for hours with no crashes or other issues. I've done a lot of experimenting with voltages at higher levels (closer to or at 1.30v), but my card can't stay stable at voltages over 1.225 it appears.

My fps in BF3 with Ultra settings and 1080p average around the 60 fps mark, with the minimum usually between 40-45 fps. My minimums usually don't surface unless there is a ton of action going on in a concentrated area on the larger maps. I previously owned two gtx 580s in SLI, but it appeared the game wasn't fully optimized for SLI (had some major gpu usage fluctuations). I also could no longer justify the cost (nearly $1000 total). I think I'll just hold onto my 7970 at this OC setting, and consider purchasing another for crossfire later in the year if deemed necessary.
post #896 of 38701
Can one of the pro's chime in on whether bios flashing could possibly help obtain a better or more stable overclock?
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post #897 of 38701
Strange bug / feature...

If I load up Crysis2 (Ultra / High Res), my 7970 seems pegged at around 65-70%, however if I alt-tab out and back in again, I get 95-99% usage and it turns silky smooth.

Anyone recreate this mysterious bug?
post #898 of 38701
Quote:
Originally Posted by trippinonprozac View Post

Can one of the pro's chime in on whether bios flashing could possibly help obtain a better or more stable overclock?

i havent tryed another bios just the stock sapphire... im about to put it in my gammer see how it fars
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post #899 of 38701
Quote:
Originally Posted by DOM. View Post

i havent tryed another bios just the stock sapphire... im about to put it in my gammer see how it fars

your gammer?
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post #900 of 38701
Quote:
Originally Posted by trippinonprozac View Post

Can one of the pro's chime in on whether bios flashing could possibly help obtain a better or more stable overclock?

From what I have read that seems like a pretty bad overclock. Man I hope my msi's are not the same... rolleyes.gif I think ill be opening 1 and seeing first, then if all goes well crack the other open. Anything under 1200 core and I am going to be a little upset. My 5850 took a 275 mhz overclock no problem, I would expect 28nm to be able to achieve the same or better. Time will tell smile.gif
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