Powercolor AX7990 Flash to Devils 13! Unlock Overclock

I recently aquired a powercolor 7990 to play with. With the factory BIOS It was an ok card. Powerful to say the least, However Overclocking was decent. From a factory core clock of 900mhz, the maximum speed I could make a successful 3dmark 11 pass was 1080. With my 3930K at factory default speed, and memory at 2133, this achieved a score of around 14500

During PDXlan 22 In portland Oregon, Powercolor had a booth. I was able to inspect my AX7990 against there Devil 13. Visual Comparison suggests that Both card are identical, the devil 13 having a red fan shroud vs my all black card. I asked the reps if there was any other difference, and they said just clock speeds and some more aggressive bios settings. This hardened my belief the cards were identical other than the bios.

I acquired the devil 13 Master, and Slave bios and Used the newest ATIflash to flash both the slave and master bios with the corresponding devil 13 bios. Success. Both bios flashed correctly and the system booted into windows. Windows detected new hardware and installed drives as if I had installed a new card. I expected this. I had originally flashed the bios in an attempt to unlock the voltage adjustment of the AX7990 because forum posts suggested the devil 13 had unlocked voltage control. I was disappointed to find that this DID NOT unlock my voltage control Afterburner. What it did do was set my default gpu core clock at 1000mhz. I decided to begin Overclocking tests regardless of voltage control to see if the bios settings were in fact more aggressive, AND THEY WERE. I quickly found that I could MAX OUT the sliders on both the GPU core and memory. This resulted in an Overclock of 1125 core and 1575 memory. 3dmark 11 resulted in a score of over 16000.
Forgetting to reset the Clock speeds to default, I realized that I had been gaming with the clock sliders maxed out for 3 days straight with no problems. I am now playing Bioshock Infinite with the clock sliders maxed with no problems what-so ever.

I will post benchmark screenshots soon.

Sweet. I always thought that the 2 powercolor 7990's looked basically the same except for the the red on the devil 13 when I was drooling over them on newegg.. I never ended up having enough money to test this idea. So way to go man.. I guess it makes perfect sense that powercolor wouldn't waste money on engineering a second 7990 after they already had a decent design with the devil 13. Before and after screenies would be cool. I am curious how much it has effected the temps as well. good luck..

Yeah, im exploring the idea of modifying the bios to extend the overclocking range. If anyone has any experience with ati bios, I would love to discuss this with you.

Have you tried Sapphire TRIXX ?

Actually I have found that asus gpu tweak will allow me to extend overclocking range quite a bit, and afterburner allows me to unlock an extra .1 volt, so I can use these two in Combination to bench at 1216 so far.

Hey there, I know this is an older thread, but I have an HD 7990 that I've been having problems trying to flash. Mine is a reference Visiontek, so I know it's different, but do you know if the procedure is the same on the reference models, in that I would have to flash the master and slave separately? If so, how would I do that? Mine has a dual BIOS switch if that makes a difference.

your reference model will not flash to a devil 13. totally different PCB. But yes, if you were to flash your bios on your card, you would need to flash both master, and slave. The Command would look something like
Atiflash -f -p 0 masterbios.rom
Atiflash -f -p 1 Slavebios.rom
Where on MY card 0 is the location of the master bios, and 1 is the location of the slave bios. make dually sure this is the case with your card as well. Atiflash -i will give you adapter information.
with the bios switch on one setting, so make sure you dont have that switch on the read only settings.

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Originally Posted by Ace123

your reference model will not flash to a devil 13. totally different PCB. But yes, if you were to flash your bios on your card, you would need to flash both master, and slave. The Command would look something like
Atiflash -f -p 0 masterbios.rom
Atiflash -f -p 1 Slavebios.rom
Where on MY card 0 is the location of the master bios, and 1 is the location of the slave bios. make dually sure this is the case with your card as well. Atiflash -i will give you adapter information.
with the bios switch on one setting, so make sure you dont have that switch on the read only settings.

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Dude you are the man! The lack of the "slave" BIOS was my problem. Fixed it, thanks again.