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Changing XFX 7970 DD Ghz Voltage

post #1 of 6
Thread Starter 
I didn't really see any how to on this and I kinda discovered it by accident. To do this you need a second GPU integrated or otherwise. You have to set the GPU YOUR NOT flashing to the primary in the BIOS. Head over to tech powerup and grab some BIOS's for you Vendor and model.

You will need 2 programs to do this.

VBE7.0.0.7b (ROM Modify Program) & (ati_winflash 2.6.7).

Boot your computer so as the GPU you are flashing is not the primary GPU through the BIOS. Once you have booted to the desktop open your VBE7.0.0.7b ROM modifier and click open.

As a side note: you want to open the stock version of your BIOS and write down the ID & vendor numbers if your going to change the model of the card.

To change the voltage just edit the voltage limits in the powerplay section, you can also set your own fan profile and stock voltages.

In my case I flashed a XFX 7970Ghz DD to a XFX 280X stock clocks 1120/1550 AMD Overdrive 1200/1700 @ 1.3V. My card was one of the cards that WAS and still is voltage locked for software mods.

On another side note it may fail the first time you flash it, this is ok just reboot and try again. Upon reboot the card will have no BIOS and will show up as just a Tahiti. If you need help or have question left me know.

*I take no responsibility if you brick your card*


post #2 of 6
Why does the card flasing have to be not the primary GPU? I thought most people knew they could unlock xfx/gigabyte voltages with the RBE tool.
Perhaps smart to share you post on this thread: http://www.overclock.net/t/1395490/ati-hd-7950-7970-bios-mod-thread
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post #3 of 6
Thread Starter 
The RBE tool does not work for these ROMs. Also I could not ever successfully flash when it was the primary card.
post #4 of 6
*meant the VBE tool, the RBE is obsolete know.

But check out that thread, many people are discussing changing the voltages of these ''voltage locked'' cards.

Many users also with XFX Double Editions and Gigabyte Windforce cards are have been succesfull.
As long as the VRM type is supported, every card can have its voltage changed.
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post #5 of 6
Thread Starter 
No matter what voltage I threw at my card I could not get it game stable past 1120/1575 @1.255V. Right now I'm rock solid at 1150/1600 @1.255V because I adjusted my TDP to 192W-392W. It seams I hit a power limit wall where the card was locking up cause it reached the TDP and tried to surpass it. My max temps still are only 72C, w/ fan at 77%. It's loud but it's fast.

My only question is how can changing the TDP damage the card? The ASUS version of my card uses 392W on full load so is it safe to assume my XFX 7970GE DD can do the same?



Update: Got Valley Bench 1.0 to run 1920x1200 1200/1600Mhz @ 1.281V, scrennie above. So 50 more Mhz on core got me ~ +50 on score and 2.1 FPS overall. Max temp was 71C. My ASIC is 64.2%.
Edited by SoloSolider - 3/12/14 at 9:02am
post #6 of 6
Thread Starter 
My ASIC is 64.2%

Updated a few more settings and found a "Corrected" memory timing BIOS that coin miners use.

With the original XFX 7970GE/DD BIOS I could scarcely OC at all, that is why I moved to the XFX 280X BIOS where I could overclock so much better. Since finding the miner BIOS the OC ability as a 7970 has come to par with the 280X BIOS. Haven't yet found the OC limit of this new 7970 BIOS but here are some stable OC shots.

I edited the 7970 BIOS to have a more aggressive fan profile and to top out TDP at 420W. Performance voltage is stock at 1.2V





Edited by SoloSolider - 3/16/14 at 10:07am
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