Hi Guys, I wanted to share some tips with everyone which drastically improved my Crysis game performance on my Mac Pro (Early 2008). If you don't own Crysis and simply want to test your system as a gaming platform, download the single player demo at: http://www.gamedaily.com/games/crysis/pc/game-downloads /crysis-single-player-demo/4960/7238/ My Specs: Mac Pro, 2 x 2.8 Ghz QC Intel Xeon (the Ocho), 6GB 800 MHz RAM, ATi HD 2600XT Ram (Don't worry, My 8800GT is on order ) Before: 1024 x 768 Resolution, All Medium Settings, Avg 16 fps 1440 x 900 Resolution, Medium-High-Very High Mix Avg 4 fps massive clipping and glitches After: 1024 x 768 Resolution, All Medium Settings, Avg 29 fps 1440 x 900 Resolution, All High/Very High (excp shdws/shdrs), Avg 16 fps no graphic glitches or artifacts The ATi GPU is the clear bottleneck in the new Mac Pro system, but the MP architecture will help compensate until your 8800GT arrives. Guide (while running Windows): Boot Camp is a must for this game. I recommend playing on Windows XP, as that provides about 5-10+ fps over Vista. Very High mode is only available on Vista, but you can rewrite your CVAR files to enable Very High (this deletes the Low settings, so Medium becomes your new minimum). Instructions and file download are here (can be applied to demo version as well): http://mrgnome.wordpress.com/2008/01/25 /crysis-enable-very-high-dx10-settings-in-xp-new-updated-hack/ The next section will deal with updating your ATi GPU, but first, update your .NET Framework so that it works properly: http://www.microsoft.com/downloads/details.aspx?FamilyID =333325FD-AE52-4E35-B531-508D977D32A6&displaylang=en Now, before you play the game, make sure you have the latest drivers from ATi. This is crucial and the main factor that increased my performance. Ati's site doesn't have the drivers listed under the apple section, you must download it from the PC section. Download and install Option 1 Catalyst Software Suite: http://game.amd.com/us-en/drivers_catalyst.aspx?p=xp/radeonx-xp And with those simple steps, you're ready to play Crysis! 1024 x 768 resolution all Medium is the best for performance, but you can still try out 1440 x 900 all High and have it not play like a slide show.