Hi everyone, Ive been lurking on macrumors for quite sometime. I recently purchased the imac 27 inch 2011 base model (2.7ghz with 6770 512MB Vram) thinking that I wasn't going to game much on the computer. But now I really want to play some games and I don't think the 6770M is cutting it. Ive read numerous posts about the impossibility of upgrading the GPU but is it possible to upgrade the 6770M with the 6970M since its comes standard in the higher up model? Would it fit? I was thinking of buying this http://www.ebay.com/itm/ATI-Mobility-Radeon-HD-6970m-GPU-MXM-3-0-Type-B-/120805690462?pt=PCC_Video_TV_Cards&hash=item1c20948c5e Its not soldered on right? And should be identical to the 6770M. It would be easily be replaced right? Also would I be okay in terms of warranty if I ever need to put the 6770M back. Its still under the applecare warranty.