I have Asus P6T6 WS Revolution which has NF200 from 6x PCI-E x16 Slots!
- x16 PCI-E Slot #1 = x16 or x8
- x16 PCI-E Slot #2 = x8
- x16 PCI-E Slot #3 = x16 or x8
- x16 PCI-E Slot #4 = x8
- x16 PCI-E Slot #5 = x16
- x16 PCI-E Slot #6 = x4
Haven't gotten around to testing the latency yet but while it adds latency there's still gains for 3x and 4x video card benchmarks although the margin gained is alot smaller versus 2x and 3x video cards.