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Worried about overclocking 6950 Memory Clock - Page 2

post #11 of 20
Quote:
Originally Posted by Dreadnought;15565245 
I edited the .cfg file and added the necessary lines, and I went into settings and allowed the voltage to be altered but it's still greyed out.

You have to restart afterburner before changes take effect. Also are you running the latest beta? I think only the beta supports voltage tweak
post #12 of 20
Reference hd6950 have sometimes hd6970 memory chips that clock to 1375/1400mhz+.

These Sapphire hd6950 Dirt 3 editions have allways regular hd6950 memory chips that clock to a maximum of 1325/1350mhz.

If tested on Crysis 2 / Battlefield 3 you will start LOSING PERFORMANCE before seeying artifacts / crashes. This is because these memory have some sort of error correction.

Just test with Heaven Benchmark with higher memory clocks and write down the min / max / avg fps... I also killed one reference hd6950 with going too high with the memory. While it seemed stable.. it whas not.

A good tool with voltage adjustment and high max core/mem clocks = Sapphire TRIXX
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post #13 of 20
Thread Starter 
Thanks for recommending Trixx.

I installed Trixx and I can change the voltage slider around as I please but for some reason it won't let me click "Apply."

If anyone could help me unlock voltages on either Trixx or Afterburner, that'd be great.

For afterburner I have gone into the CFG file and edited the two lines but it still doesn't work.

I haven't touched anything in Trixx.
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post #14 of 20
You running the std unlocked bios?

In my case i just had free play with voltage @ TRIXX,
Also make sure you set Power play to 20% @ the Catylist Overdrive stuff, and then apply clocks @ TRIXX
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post #15 of 20
Thread Starter 
Nevermind I reinstalled Trixx and got the voltage meter to work.

I am currently on 930mhz Core Clock and 1350mhz Memory at 1120 voltage.

I seem to be stable, I've been playing high quality games for the past few hours.
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post #16 of 20
Quote:
Originally Posted by prescotter;15568773 
Reference hd6950 have sometimes hd6970 memory chips that clock to 1375/1400mhz+.

These Sapphire hd6950 Dirt 3 editions have allways regular hd6950 memory chips that clock to a maximum of 1325/1350mhz.

If tested on Crysis 2 / Battlefield 3 you will start LOSING PERFORMANCE before seeying artifacts / crashes. This is because these memory have some sort of error correction.

Just test with Heaven Benchmark with higher memory clocks and write down the min / max / avg fps... I also killed one reference hd6950 with going too high with the memory. While it seemed stable.. it whas not.

A good tool with voltage adjustment and high max core/mem clocks = Sapphire TRIXX

So ur saying that people with a Sapphire 6950 Dirt 3 edition can maximum get to 1350mhz on the memory? What would be a safe spot since u managed to kill one 6950:confused:

Im currently running 960/1330 at 1.110 volts. Are these clocks safe? Is the Core clock not set to high? Is the memory to low? Cause default clock is 800 on the core and 1250 on the memory. I can run 950/1330 at stock volts without any artifacts in GPU Tool stability test. Is this a good tool to check if you're running a stable overclock?

And ofcourse my card has unlocked shaders aswell.
    
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post #17 of 20
Quote:
Originally Posted by skillsize;15573884 
Im currently running 960/1330 at 1.110 volts. Are these clocks safe? Is the Core clock not set to high? Is the memory to low? Cause default clock is 800 on the core and 1250 on the memory. I can run 950/1330 at stock volts without any artifacts in GPU Tool stability test. Is this a good tool to check if you're running a stable overclock?

And ofcourse my card has unlocked shaders aswell.

I'v been folding on my card running 960/1350 on 1.13v for over 8 months now (that's 24/7 folding), and my card is fine. Even ran some benches for the 3d Fanboy Comp on 985/1350 yesterday with no problems, so I think you're OC is safe smile.gif. However my card is a reference card so components MAY be slightly different (don't think it'll matter too much though).

I use ATi Tool, Furmark, 3D Mark and a few games to test stability. If you're stable in a bench or two and a demanding game then it's safe to consider the OC stable.

P.S If you're stable @ 960 on 1.110v then that's a very nice chip you got there wink.gif
post #18 of 20
Quote:
Originally Posted by hirolla888;15576758 
P.S If you're stable @ 960 on 1.110v then that's a very nice chip you got there wink.gif
I could run 950 on stock volts but 960 gave small pixel artifacts on GPU Tool stability test and with 1.110v it ran fine. But my memory cant be clocked that high unfortunately..confused.gif
    
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post #19 of 20
it all depends on the card i run 950/1450 folding and gaming and have had no trouble out of my card at all. but i know a couple of people who cant get past 920/1350 without artifacting
    
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post #20 of 20
When i was snooping around the net for people's overclocks with the 6950 to give me an idea of the overclock i should aim for, i realised a few things.

1. The average overclock for the memory is around 1350-1425. There were a few times when i saw 1425+ but im assuming they were looking for artifacts and not a decrease in performance that would be seen with an unstable memory overclock on the 6000 series or they are just lucky people.

2. OCing the memory seems to be killing a lot of cards, not sure if this is down to people not realising its error correction technique or if its just one of those things that happens regardless. I think it would be best to play it safe, the core is more important anyway.

For stability testing i would suggest what hirolla888 suggested, apart from ATI tool, I heard that the 6900 series has problems with it such as false artifacts but i may be wrong.
Edited by Focus182 - 11/5/11 at 2:39pm
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