Hello, I was using RBE to try to flash my 6990 bios memory clock speed down lower than 650, I backed up my bios to make sure no problems, all went well and i flashed both the master and the slave and rebooted.  ALL PROBLEMS FROM HERE, tried reinstall drivers and blue screen BSOD every time, rollbacks etc etc.

This was done with overclock switch ON.

I think I there is two bios you have to save with OVERCLOCK ON (master/slave)  I only saved the master bios I think !!

I reflashed back to old master bios, flashing worked, but flashing the slave with the same bios did not work, and reboot everytime gives bsod or blank screen and reboot needed.

Now if i switch the OVERCLOCK OFF switch back to default, everything boots fine and I can use the card no problem.  But i need overclock ON. As im loosing about 80m/hash on each GPU core without overclock on!!


Any insight into fixing this would be great, If anyone has a 6990 and can give me a copy of the stock (OVERCLOCK SWITCH ON) master + slave bios so i can reflash this back and use overclock again (can be done with atiflash software "atiflash -s" or with RBE).

Any help would be much appreciated and donations given.  Thank you.

edit: I have the Sapphire Radeon HD6990

OK I just was able to acquire another 6990 today so i should be able to fix this myself later!!

Confirmed that there is two different bios (master/slave) on the overclock setting... I will post here in case anybody in future hits the same problem (ripped with GPU-Z)


Overclock switch=ON BIOS 0

http://gpuz.techpowerup.com/11/05/16/4n7.png
http://www.sendspace.com/file/htfpz6



Overclock switch=ON BIOS 1

http://gpuz.techpowerup.com/11/05/16/e48.png
http://www.sendspace.com/file/ykg643



 

You can find a mass quantity of factory GPU BIOSes archived here:

http://www.mvktech.net/component/option,com_remository/Itemid,26/