Re: PCI-e 2.0
Any motherboard that supports regular PCI Express will be able to run that card, but it will be limited to the 16x bandwidth of PCI-e. It's like running an 8x AGP card in a 4x AGP slot: it'll work; the card will just be limited to 4x.
With the 8800GT, there should be little, if any, performance difference between running it in a PCI-e and PCI-e 2.0 slot. To my knowledge, the 8800GT doesn't exceed the 16x bandwidth of PCI-e.
ASUS A8N32 SLI-Deluxe, AMD Athlon X2 3800+ @ 2.8GHz, eVGA 8800GTS 320MB, 2GB Corsair XMS DDR400, 160GB WD HDD + 320GB Seagate Barracuda 7200.10, AC Freezer 64 Pro, 700W OCZ GameXStream, NZXT Zero :D
I think I've decided to leave... maybe I'll come back sometime.