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6950 and voltage control !!

post #1 of 11
Thread Starter 
Hello everybody , iv been playing with my 6950 ( flashed with 6970 bios ) for a while now trying to get the best clocks etc .. The best i can manage is 890/1390 on 1.175v .

I just downloaded trixx 3.0.4 and tryed to increase voltages but the slider is locked assuming because i have 6970 bios on my card .. But the voltage slider works in msi after burner and if i apply at 1.3v it will work and show im using 1.3v but even at 920/1400 it will crash..

This is leading me to believe that the voltages are not applying , yes i have added the 6970 code into profiles in msi ab directory .. Trixx says im running at 1.175 v and ab claims im at 1.3v even though increasing voltages doesnt allow me to clock higher ..

my temps usually load at 63-65c during gaming at 880/1375 1.175v so im sure i got more headroom for overclocking and heat isnt the issue .

plz any one , help ? + rep

am i better off using the unlocked shader mod and increasing voltages via trixx on the unlocked 6950 bios ? iv seen people hit 950 on these cards easily but mine will crash instantly at 950 @ 1.3v .


Edited by Xristo - 3/2/11 at 3:27pm
    
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post #2 of 11
Thread Starter 
Gee guys , thanks for the advice ...
    
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post #3 of 11
Thread Starter 
i have another question , im siting here right now looking at my ab hardware monitor .. going on OCN causes my card to go back n forth from 0.9 v to 1.175 v and the frequency is dropping up and down whenever i load another page etc .. is this normal or should it just stay at 0.9v while browsing ?
    
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post #4 of 11
From reading up on MSI afterburner in Guru 3D, voltage control does not work on 6950 flashed to 6970. To get it to work, you will need to do the VDDC mod (courtesy tsm106).

http://forums.guru3d.com/showthread.php?t=336682&page=2

Also, you will need to disable ULPS in windows registry. Else it will not be stable at higher clocks. I am able to do 900/1400 easy on stock. I could have gone further, but decided not to.
To disable ULPS, go to windows registry, and search for 'enableULPS' without the quotes. Change value from 1 to 0. Do not touch the other ULPS stuff.
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post #5 of 11
Thread Starter 
thankyou for ur reply ... + rep
    
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post #6 of 11
Thread Starter 
just to let you know this didnt do anything to help stablilty , thanks though .

I think this is only xfire related . Maybe its just the limit of my gpu .. it runs great on 6970 bios default settings ill just leave it and exchange it for a 6990 on release .
    
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post #7 of 11
i had the same problem with the first card in my CF set-up

Dont know if this problem only consist on CF'd 6950's

I had to disable ULPS in registry.

Then in MSI AB config file you have to enable unofficialoverclocking.

In that same config file from MSI AB Set UnofficialOverclockingEULA field to the following text: I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it

After that go start MSI AB and go to settings.
There under safety properties enable Voltage control and Force constant voltage.

This is only way for me to apply voltage on both cards.


Another tip:

Not all 6950's do good on high memory speeds, my second card crashes when i up it over 1275mhz allready. But the first card i had over 1400mhz.

I would advise you then to set memory back to original 1250mhz and just only focus on the core first. when you found max core frequency start clocking your memory
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post #8 of 11
You probably just hit the limit of your card.

My cards are stable at 920MHz using 1.175V. When I tried using 1.165V for 920MHz, it crashed (so voltage control was working). I've tried applying up to 1.3V to go above 920MHz, but it didn't matter. It only generates more heat and isn't stable above 920MHz. I just hit the limit of my cards.

Keep in mind these chips were binned for 6950's, not 6970's. They're meant to be ran at 800MHz using 1.1V. I would consider your 90MHz overclock pretty good.

You may see people easily hit 950MHz on their cards, but what you don't see are the 100 other people who can't get above ~900MHz (I just made this up, but you get the idea). Try to look at it as you got a 6970 for a hefty discount.
Edited by compudaze - 3/2/11 at 10:35pm
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post #9 of 11
Thread Starter 
thanks for the reply's everyone + rep given ..

and yes 900mhz core isnt too bad considering its default is 800mhz and now it has 1536 shaders it wasnt too bad of a deal im not complaining im just trying my best to see whether or not i can clock this baby higher .. but unfortunatly not , but its still a great card !! im hoping future release drivers will improve on performance for these cards .
Edited by Xristo - 3/3/11 at 2:09am
    
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post #10 of 11
Have you tryed the settings i sayed in MSI AB ?
Have you tryed with a lower memory clock yet ?

i am currently on 1.19V and card 1 reaches 965/1250 and card 2 930/1250 with that.

Still need to tweak a bit more and hope to end up at 1ghz with card 1 and 950 with card 2
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