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HELP! Unlocking voltage for Gigabyte 7950 currently with FX0 Bios

post #1 of 10
Thread Starter 
I just bought a Gigabyte Windforce HD 7950 model GV-R795WF3-3GD with bios version FX0.

The card is clocked for 1000mhz core and 1250mhz memory at 1.25v

I have read a few forums that state you can flash the bios back to F43 using ATI flash which I did do. But it didn't not unlock voltage and I lost clock speeds in gpu-z and afterburner and CCC. I reflashed back to the FX0.
http://forums.overclockers.co.uk/showthread.php?t=18469510

Has anyone had any success with this card and unlocking the voltage? I can only get this stable at 1050mhz and 1375mhz memory. Since the card is very high clocked up out of the box.

Any help or links to guides would be great.
 
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post #2 of 10
Unfortunately I think you will find your card is hardware voltage locked, (one of mine is the same).

Your best bet is to leave it on the FX0 BIOS and use Sapphire Trixx to overclock it, this will allow you to adjust the core voltage anywhere up to 1.2V

Otherwise if you happen to find a way around it I will be very interested in how smile.gif
post #3 of 10
yes the newer versions of Gigabtye HD 7950 are voltage locked. try other BIOS versions. if a BIOS flash can't enable it then mostly the PCB design does not support voltage control.

you should be able to overclock to 1100 - 1150 mhz at stock voltage of 1.25v. some people even hit 1200 mhz at stock voltage. keep your core temps below 70c and VRM temps below 90c. good luck

there is a thread for gigabyte HD 7950. you can ask your doubts there too.

http://www.overclock.net/t/1313813/new-bios-update-for-gigabyte-hd7950/470
Edited by raghu78 - 3/17/13 at 8:11pm
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post #4 of 10
Thread Starter 
The card I have, I have confirmed is a reference 7970 PCB.

Video freezes during game if you go over 1075mhz core, highest temp I have seen is 58c VRM temp 62c
 
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post #5 of 10
Quote:
Originally Posted by highendpcgamer View Post

The card I have, I have confirmed is a reference 7970 PCB.

Video freezes during game if you go over 1075mhz core, highest temp I have seen is 58c VRM temp 62c

Does it have the 6 pin + 8 pin power connectors?
post #6 of 10
Thread Starter 
yes mine does
 
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post #7 of 10
Quote:
Originally Posted by highendpcgamer View Post

yes mine does

Have you had a look at this thread?
http://www.overclock.net/t/1281711/hd7950-revised-with-reference-hd7970-pcb-club

First post has instructions on flashing a 7970 BIOS to your 7950 (7970 reference PCB) card, although they don't specifically mention Gigabyte cards, and I'm not sure if this would help you with stability whilst overclocking but it could be worthwhile looking into.
post #8 of 10
Thread Starter 
Going to flash it now, wish me luck!!
 
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post #9 of 10
Thread Starter 
Well it looks like a no go, still voltage lock on every bios I have tried. I am guessing hardware locked frown.gif

Still happy with the card very fast and good value to performance ratio.

But this is OCN so I want to push this to the max anyone else know a work around?
 
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post #10 of 10
Quote:
Originally Posted by highendpcgamer View Post

The card I have, I have confirmed is a reference 7970 PCB.

Video freezes during game if you go over 1075mhz core, highest temp I have seen is 58c VRM temp 62c

how are you monitoring the vrm temps?? I have the same card with 8+6 pin with FX0 but can't monitor VRM temps
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