asus p5p41c pci-e 16x wondering what nvidia cards will work with this mobo. what bit rate card to use 128bit,384bit, does it take pci-e 3.0. should I use nvidia GDDR3 or GDDR5 can it take a gtx 750/760/770/780 GDDR5, or a gtx 780 384bit GDDR3. I would appreciate anyones help and thanks in advance. have ddr3 2x2gb ram, core 2 duo 3.o 6m 1333, 500 watt psu, 1.5tb hdd.