I, have had this problem for a while, just never complained because it worked fine with my gtx 560. Now, Its starting to become a nuisance to me. I'm bottle necking like crazy today, when I installed my xfx 7950. I've tried everything. Pulling out the battery to the motherboard and putting it back in. Speaking about that, My motherboard is the gigabyte 78lmt-s2p. Which, I do not understand it is an AM3+ board Anyy suggestions?
Looking at all three revisions of that board, I find no information on Piledriver CPU support - the lates BIOS only provides support for Bulldozers up to the FX-8100. You may inquire with Gigabyte to find out if support is pending - doubtful since the power for that CPU doesn't appear to be built into the board. Likely, you'll need to upgrade your motherboard to enable all the features of the 8350.