Kajniko

Hi, I'm new here, but I have read some threads about upgrading my M17x R3 from a 6990M to a Nvidia GTX 770M (ordered today, but now i realised without bracket and heatsink) I think my 6990M is dead, because after a fresh Windows 7 64 Bit, I can't install the ATI driver, get black screen during install process The Heatsink seems to work (with a little modding - I still can't see the pics) but what about the X Bracket? Does the AMD Bracket work on the Nvidia GTX 770M) Because: Insteed of buying a new bracket, I'd rather order a Radeon 7970M, it's not so much more expensive then -.-