Don't do eet! You'll brick your card! They are incompatible!
I suggest going to some hardware forum and asking first or finding some info before you do anything. check this post http://hardforum.com/showpost.php?p=1037084150&postcount=16.
You don't have a bios switch right?
Once you're confident enough that you know what you're doing, dump your bios, make about 15 backup copies, modify it with RBE, and pray that you can flash it back. Or, even better, see if you can find an already modded, working bios for YOUR SPECIFIC CARD on a forum.
good luck