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Problems overclocking 6950

post #1 of 15
Thread Starter 
Hi everyone,

I have an XFX 6950 2GB (the non-reference version), and am having some difficultly overclocking it.

I tried MSI AB, but couldn't get it to do unofficial overclocking, so I tried Sapphire Trixx, which seemed to work well.

However, once my card hits 80*C, it starts artifacting. I have messed around with it, and it doesn't seem to be clock or voltage related, it just artifacts the second it hits 80 degrees. So my question is- Is there any throttling that could be occuring because of this temp?

I thought these cards were good for 95* stable. I am currently trying 927 mHz on the core at 1.24v. I am in GPUz, and am not seeing any throttling on the core speed, voltage, amps, memory, nothing.

Thank you for your help!
Ben
post #2 of 15

I'm not trying to knock XFX here ... but for the high level of voltage you've got (1.24v) the quality of the internal components may not be able to handle that, which leads to your artifacting ... in other words, I think you have an unstable OC / OverVoltage of your card.

 

Even the higher quality Asus DUCIIMSI PE/OC TF3 and Sapphire TOXIC edition cards which have much better higher quality 8-phase PWM power circuit Dynamic Phase Control design, better quality Solid State-Super Ferrite Chokes, Digital VRMs, Dr.Mos MOSFET's, and Solid State Capacitors and Hynix Semiconductor memory chips, etc. ... even THOSE cards have difficulty at voltages around 1.25v, so I don't doubt that your XFX would be having hicups ... IMO try backing off your voltage {keep it at or under 1.2v} and backing down your OC a bit and run some FurMark and/or Heaven Benchmarking to see if that gets rid of your artifacting issues.

Good Luck thumb.gif

   
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post #3 of 15
My MSI 6950 2GB twin frozr II's don't like over 1.22 volts, or anything over 900mhz core. Don't feel left out haha
    
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post #4 of 15
1.22vcore seems pretty high

I have several 6950s the worst one runs 930mhz core @1.18v others around 1.15v

Try manual fan settings auto setting ain't aggressive enough
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post #5 of 15
Forgot I have one running 1.0675v in gpuz@950 MHz don't know if it's the card bios or gpuz problem or I have a great quality card
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post #6 of 15

You down volted it ? WHY may I ask ? most all HD-6950's run stock at 1.1v = 800/1250/1408

I've got my Sapphire HD-6950 TOXIC running at  950 MHz / 1400 MHz / 1536 @ 1.218v and it idles at 36c / FurMark pushed it to 78c at 70% Fan, and my case is as SFF as you can get. 

 

      Quote:

Originally Posted by qwertyegg View Post

Forgot I have one running 1.0675v in gpuz@950 MHz don't know if it's the card bios or gpuz problem or I have a great quality card


 

   
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post #7 of 15
I'm running both of my unlocked 6950's (reference cooler) at 1.245v / 930 core / 1425 mem with no issues while gaming. They never hit 90C with my custom fan profile.

It's very possible your card's a dud if it artifacts at 80C. Might want to check with multiple utilities that the GPU is actually at 80C (MSI AB, GPU-Z, RealTemp, HWMonitor, etc). Also, like LA_Kings_Fan mentioned, the voltage shouldn't be lower than 1.1v. And you said you have 2 cards?
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post #8 of 15
I've got for xfx 6950s running 970/1470, shrugs.
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post #9 of 15
Thread Starter 
80*C is definately the problem. Should I RMA the card or just consider 79* my limit and see what I can get with that?
post #10 of 15

The thing you're not getting is ... I don't think it's a TEMPERATURE issue ... unless your card is just a dud ... but normally 6950's can run fine up to and beyond 100c, of course lower temps are better, but you shouldn't be getting artifacting just because of the 80c temperature, it's because of the VOLTAGE and OC more likely. Did you even TRY backing things down a little ? IF say at under 1.2v and 80c you STILL get artifacting then yeah ok it's somehow TEMP related and maybe you need to consider an RMA back to XFX ?

 

Quote:
Originally Posted by iMerciless View Post

80*C is definately the problem. Should I RMA the card or just consider 79* my limit and see what I can get with that?


 

   
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