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high5ths

macrumors newbie
Original poster
Mar 10, 2011
17
0
NYC
I've got a MacPro (5,1 single processor, 3.2 GHz) with two graphics cards installed:
  • ATI Radeon HD 5770 with one DVI and one Mini DisplayPort monitor attached
  • NVIDIA GeForce GT 120 with one DVI and one Mini DisplayPort (to DVI adapter) attached

Most of the time the computer feels fast and wonderful. Occasionally, though, I notice everything getting SUPER slow -- and I happen to notice that iStat Menus shows the active GPU as the GT 120, not the 5770. Restarting usually fixes it, but it's really annoying... anybody know what's going on?

Thanks,
Jeff
 
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