For auto adjusting, you should be able to mod the BIOS with RBE and then just flash the card. Worked great on my 4870 (non-X2) before I put it under water.
__________________ Project: Black and White i7 920 D0 | 3 x 2GB DDR3 | EVGA X58 SLI LE
XFX 4890 | Corsair HX750 | Corsair Obsidian |