On 3-way SLI 780i Mobo can u /or/must u run 3 of the exact same cards or can one hybridize ? Such as 2 --260 GTX at 896MB and say 1 460 gtx. or any other combo thats workable???Any help would be appreciated.
To SLI you must use identical cards. You can use a different nvidia card for PhysX only if you like. So (2) 260GTX's in SLI and a 460GTX for PhysX.
You can't run SLI with 2 different cards you must have for example : 3x 480 not 1x 580 and 2x 480, and as jay2tall said you can use one card for Physx