Re: GTX 460 SLI Trouble
Based on your screenshot, you will want to configure Physx to run on the cpu. I'm thinking with Physx configured to run on the second GTX 460, this is why you can't enable SLI.
I have Physx running on my cpu in my own system.
ASUS P7P55D Deluxe, Core i5 750, 8GB's of DDR3 1066, ASUS Xonar DX, MSI 1GB OC Cyclone GTX 460's soon to be SLI, ASUS U3S6 card, Antec Truepower Quattro 850 watt, Antec P183, C300 128 SSD, 120GB WDC harddrive, two 320GB WDC harddrives, Viewsonic VG2030wm monitor, Win7 Ultimate 64bit.