I recently migrated to a Mac Pro after years of running a number of hackintosh systems. I got tired of the effort involved in updates, constant tweaks, and 95% functionality so I picked up a 2009 Mac Pro, flashed it to a 5,1, upgraded to an i7 970 and 12GB of non-ECC RAM, and installed Windows via bootcamp to flash my reference EVGA GTX 680 (02G-P4-2680-KR). My issue is that none of the GFX sensors show up in Temperature Monitor, Hardware Monitor, or iStat Pro. Has anyone else had similar issues with Nvidia cards in Mavericks? I may load up a Mountain Lion partition this weekend just to see if the problem persists.