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6950 OC advice

post #1 of 9
Thread Starter 
I got a HIS 6950 2GB from a member of OCN. When I got it the shaders were already unlocked.
The clocks were 800/1250
The max I was allowed to raise them in MSI afterburner was 840/1325
I fixed that problem now I can raise it to any frequency.

Question how do I find out my bios version?
Should I be concerned about raising anything too high because of voltage or heat issues since the shaders are unlocked?

Also is there any benefit to having the 6970 bios as oppose to the modded 6950 bios that I have?

Thanks
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post #2 of 9
No advantage to the 6970 BIOS.

Shoot for stock 6970 clocks first and work your way up from there..just run stress tests and if it crashes, up the voltage a small amount, rinse and repeat.

It's a long process to get the smallest amount of volts..if you want you could dirty OC it and throw a decent amount of volts at it and work your way down instead.

Make sure to set PowerTune to 20% in CCC.
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post #3 of 9
nope. max you can get in AB is 1.3 and you dont ever want to go higher than that, especially in air cooling. i'd stay lower.

Bios version? try gpuz. why do u need it? it's not needed

6970 bios? not needed. u should even need to know about it but ill shed some light on it

there's speculation that since the 6970 has higher binned ram chips, the 6970 bios may have changed the timings on the bios and that may influence how the 6950's ram will act. since u have a modded 6950 bios, it takes that speculation away and doesnt mess with ram timings. you basically have an underclocked 6970- without the ''ram timings.''

just oc it to 6970 speeds. somewhere around 1.15v and 880 core. although im sure u can go higher.
    
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post #4 of 9
Thread Starter 
"Dirty OC" I love that term lol I guess that is how I OC'ed my CPU then.......

What should I shoot for at first in terms of volts, is there a ballpark for what will be needed for 6970 stock...which is? (880/1350??????)

Edit: 1.15v thanks I'll start there
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post #5 of 9
iirc, 1.15v as i had up earlier.

for comparison, im at 976 core with 1.19v as a dirty oc and has been stable- except crysis 2. idk if it's having problems with any of my programs open or what not.

my other program that i use to run computations with my gpu has been stable at that clock speed. been running a few days straight. im on water btw, so for stock cooling, idk. it's loud haha.
    
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post #6 of 9
Flashing a full 6970 bios seems to help to achieve higher memory speeds - and on these cards you might as well not bother OCing the ram unless you can get past 1400mhz (the ecc barrier) as anything in between usually either does nothing or reduces performance.

I wouldn't bother personall, as the 6970 has physically different ram chips as I mentioned in another thread, and they're specified for higher frequencies, tighter timings and higher voltage.
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
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8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
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post #7 of 9
Quote:
Originally Posted by noahhova View Post
"Dirty OC" I love that term lol I guess that is how I OC'ed my CPU then.......

What should I shoot for at first in terms of volts, is there a ballpark for what will be needed for 6970 stock...which is? (880/1350??????)

Edit: 1.15v thanks I'll start there
Some cards can do 6970 stock clocks on stock 6950 volts (1.1)..just try it out and if not bump up to 1.15..if 1.15 works, bump down until it doesn't work anymore..unless you want more than 6970 stock clocks, in which case bump up to those, start at 1.15, and work your way up if it crashes on you.
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post #8 of 9
Thread Starter 
What program should I use to test the OC. Furmark seems to make my card whine when it is on. Doesn't sound good so I always want to turn it off lol.

I have synthetic benches but is there a "best" test for testing graphics that one take 6 hours or so.

Also when I tried 880 1375 at 1.175 it crashed almost right away in 3D Mark06. I have actually frozen up at 1.21 volts after succeeding with those settings in 3d mark11 and vantage.
Could this just be a conflict with 3dmark06?
Edited by noahhova - 4/27/11 at 10:53am
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OCZ Vertex 2 50GB 640GB WD Black/500GB WD Samsung DVD Burner x24 Windows 7 Ultimate x64 3x Samsung SyncMaster E2320x Eyefinity - 6048x1080 
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Rig
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Hard DriveOptical DriveOSMonitor
OCZ Vertex 2 50GB 640GB WD Black/500GB WD Samsung DVD Burner x24 Windows 7 Ultimate x64 3x Samsung SyncMaster E2320x Eyefinity - 6048x1080 
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post #9 of 9
Everyone has their own opinions of how to check for gpu stability.

3dmark isn't to bad of a test, but you also have to remember that it taxes the cpu/ram a lot as well.

I use furmark with maxed out af/aa so that it maxes my gpu usage to 100%. Then I check for artifacts after awhile, and then I play a few games with that speed to make sure it's stable. The only true stability test is just playing real world games. I also hear some people like to loop the crysis benchmark demo 99 times.

Also, the "whine" that you hear is most likely capacitor whine and is nothing to worry about. My 6950 also has cap squeal every time that I play games.
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