...me too ... Now I'm using 208828.rom which is the best of all but more instable.. very high current consumption .. low and instable Hashrate...
I am looking for a hardware solution... but I can't find high definition images of the pcb for comparison
i guess you still need a modded bios to run 8gb over 4. now i managed to get the card running at 4gb , have to test other 8gb bios but there are a lot of tricky things to do