I have a optiplex755 with a hd7970 8 GB gskill 6400 e8400 gb processor 1050 powere suply, and three hard drives. One for windows, one for game rirectories and one for storage. Had to sheer 1 1\2 inch of metal off the back to fit double faced card. Re mounted the heat sink by flipping it horizontally. I used the metal i sheerd off and made a heat sink braket out of it. Mounted a 10000 rpm server fan to it. Mounted case fan in rear. Put front fan back in. Tapeed a hole in bottom of case next to heat sink and drilled a hole through edge of heatsink lip to secure the other side of it. Going to upgrade to the 3.3duo quad next for final upgrade. Did this all for $250. Plays all new i7 rated games flawlessly at 1080p on a 65" lg led. I run at 39 %c at full load with artic silver, ran 45-50 with regular paste. Will post pics if there are non believers. Happy building.