Have had my 7870 Tahiti for over 5 years now, but I hooked a second monitor up and am running into the 300/150 overclock bug. If overclock is set anywhere (such as Afterburner), the 2D rate drops to 300core/150 memory and I get artifacts/flickering on my monitors. Doesn't happen if no overclock is set, but if there is even a 1mhz change it happens.
I have a workaround right now by setting the OC into the bios itself and it is fine and stable. I think it is a driver bug but clean uninstalling/reinstalling drivers has not fixed it, nor has any other fixes I've tried from other forums (such as registry changes or resetting registry with Radeon Mod). So I would like to try to fix it by setting the State 3 #7 speed in VBE7 but it does not allow you to increase it from 300/150. I was going to try to hex edit the rom but could not figure out the formatting. Maybe a bad idea but has anyone managed to fix this bug? I would like to be able to use Aftertuner to manage my overclock again.
Also I am curious if it is at all possible to flash these cards to a 7950, has anyone tried it? Is it impossible?