Hi there.. I have bought a 2. hand 27" imac (3,1ghz with 1gb 6970 graphics) with power supply faliure.. Replaced the power supply and put in a SSD to run OSX.. installed Lion from the disk in the box (10.6.6) on the SSD. Everything seems to work fine except from the fans.. runs full speed.. fixed it with Macs Fan Control.. super. Updated to 10.8.4.. seems fine.. I play diablo 3 and hoped for a smooth gaming experince.. but no.. the imac runs D3 just as bad as my old 20" imac (9400m) (25fps with everything on low) I read somewhere that i should try run it in windows.. Installed win 7 in bootcamp.. on the normal harddisk.. and installed Diablo3.. and woop.. runs perfect.. highest res.. everything on high.. about 80fps.. as i expected fron this imac.. My friend with a late 2009 27" 4850m imac runs D3 much better in OSX.. Is it possible that i have installed a "wrong" copy of OSX.. ( i wondered if the dvd in my box is not right for my mac) though "about my mac" say the right thing.. 3,1ghz 8gb 1333mhz 6970m ect.. Is it possible that the drivers in osx dosnt fit my mac? I get about half the point in Novabench as others with the same Mac.. (4000) others get 8000. I love my mac.. and osx.. and i hate to play in windows.. It just seems wrong that a "big" mac has such a lag op gfx performance in its own OS.. Its the same in other games.. Half life2.. starcraft2.. On youtube i can see videos that shows the same mac run D3 perfectly in OSX.. I dont think my mac has a hardware problem (just the fan problem(tested in AHT)) when it runs fine in windows.. Hope for some answers other than " a mac is not ment to be played on" well there is probably a reason they put in a 6970 card? Kristian (denmark) ---------- I have no graphic issues.. the imac runs perfect smooth.. and all tempertures seems normal.. in windows the gpu temp increase to about 50deg when i play games.. and decrease perfect after i exit the game.. This dosnt happen in osx.. it seems that the games dont use the GPU at all.. and i just play games with "software acceleration" and no hardware..