Here's what i'm using..
-ASUS P5N32-E SLI LGA 775 NVIDIA nForce 680i SLI ATX Intel Motherboard
This is copied from my mobo's specs page on Asus' website..
-2 x PCI Express x16 slot, support NVIDIA® SLI™ technology, at full x16, x16 speed (blue)
doesn't say 1.0 or 1.1, so i'm assuming its just 1.0. just trying to see if i can get a Nvidia GTX 280 in this baby.