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Sapphire 6950 Dirt 3 Edition unlocked vertically splits in two BF3 - Page 2

post #11 of 20
Try with a memory clock of 1325mhz, and try from there.

In my case shortest way to test stabilty of all games / benchmarks = Crysis 2 @ DX11
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post #12 of 20
Thread Starter 
U think this card can handle 1000mhz on the core? And leaving the memory at 1325?

So there is no real differents in FPS between 1325mhz or 1350mhz on the memory because around 1350 mine gets unstable?
    
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post #13 of 20
There will be a difference but unless your eye is magic and can see a 0.1-0.5 fps increase your going to be fine lol. Hell, 0.5 fps is probably being optimistic.

As for the core, no one knows... It depends on how far you are willing to push that voltage and the limit you would like your temp to be. But most of all its luck of the draw that you got a good card. My recommendation would be a maximum of 1.22mV. Some say up to 1.25mV - 1.3mV as a limit if your temps are ok but i like to play it safe with volt tweaking, its all up to you though.

For temp i would say stick below 90 on full load, preferably under 85 if you can.

Also, i agree with Prescotter, Crysis 2 is fantastic for stability testing. Crysis 1 is also great and is what i use to check my stability.
post #14 of 20
Hello, read good skillsize:

I dont think your card will get you 1000mhz on core.

Our cards are limited to 1.180v in both Sapphire Trixx/ MSI Afterburner.
With that said, you probably will get from 900mhz to 925mhz core.

Just start with 900mhz core and 1325mhz memory as a target

Then take the core 5mhz higher each time and then test with a gaming session
When stable up it 5mhz more, till you find your max, then back down 5mhz to a nice round number,

Same goes with the memory.
Estimated memory clocks are between 1325mhz and 1350mhz like i told you.

Recently im also running just 900/1325, as they are nice round numbers. And its better then running your card at the edge of stability... And it will perform same level as a hd6970. With higher core clocks and a tad slower memory.

@Focus182
In my opinion when running 1.180v on the hd6950, with only 6+6pin, instead of 8+6pin power,
I would recommend keeping all 4 temprature sensors under 75c.

Especially the power management and MEMORY CHIPS.

I killed a hd6950 with high OC's and running it in the 90-100c range. With stock voltage.

Now ive been running OCed 1.180v with Custom Fan Profile at a max of 75c.

And going perfect so far, for 6 months in a row, pc running 24/7 smile.gif

drunken.gifteaching.gif
Edited by prescotter - 11/5/11 at 7:33am
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post #15 of 20
Quote:
Originally Posted by StarDestroyer;15574688 
I used to have a problem in F1 2010 that looked like that, it would remain after exiting to win7, requried restart, haven't seen it for a while though

and it might have been my 6950 OC, because when I use a x5 955 I used to apply GPU OC

since I had new MB and i5 I never bothered with GPU OC

although much higher GPU OCs in other games never had the problem, ever
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post #16 of 20
I like some other users have only gotten that kind of splitting when the OC is to high I would just keep backing down your clocks till you can get it to run 100% stable it's not worth toasting your card over. Also 70* does seem a bit higher, mines over volted to 1.165 and it never gets above 65* and that's with auto fan not hitting over 45% under benching load.
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post #17 of 20
Thread Starter 
Also i could run 970/1375 at 1.175v in Heaven Benchmark Score is 1979. And no artifacts and temp stays below 70c. How come when I play BF3 my screen splits? In other games it doesnt happen!!

EDIT:
Also could it maybe be my Power supply? My power supply only has 1x 6-pin PCI-e cable so I used one of the Molex to 6-pin PCI-e cables that came with the card!

My power supply is pretty old aswell I bought it like 5 years ago.

See my rig in my signature!
Edited by skillsize - 11/7/11 at 10:34am
    
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post #18 of 20
Thread Starter 
Also happens on Modern Warfare 3 now after a few games when I had 880/1300 clocks...

Please read my post above frown.gif
    
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post #19 of 20
Amd uses GDC on the memory. So if it goes out of spec it corrects errors and slow the cards performance down.
post #20 of 20
Hello! after googling around i found this thread.
Last friday i bought a PowerColor Radoen HD 6950 from the online store i usually buy computerish stuff from. Two days ago i got the card, uninstalled the previous card and installed this one. The day i got the card i played some wow, HoN and BF3 campaign i didnt really try to test the card out much, because i had to send my old one back. I played BF3 on the same settings as i did on my old HD5830 card.
Anyways, after playing some that evening, i went to sleep. When i turned on the computer the day after BF and HoN would make this exact same bug happen and it follows me to windows when i close the games. The bug sometimes fixes itself in windows, if it doesnt the only way to solve it is to reboot.
one thing i find kind of strange is how wow doesnt seem to be affected by this, and how HoN stopped bugging when i turned it from Directx to Opengl.

My cards factory settings are 800/1250 0% "power controll settings"

edit1: i just ran furmark with the factory settings and the bug started and went on like it usually does, but this time after the screen had turned totally ballistic and had vertical stripes from one side to another a bubble appears telling me that the graphics driver had stopped functioning and that windows killed it and restarted it. After this everything was fine except furmark not responding.



edit2: the bug im refering to is the one on the pictures.
Edited by kjipsokk - 12/2/11 at 2:30pm
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