Specifications > Expansion Slots > PCI Express x16http://en.wikipedia.org/wiki/PCI_Express
PCI EXPRESS 2.0
"PCIe 2.0 motherboard slots are fully backward compatible with PCIe v1.x
cards. PCIe 2.0 cards are also generally backward compatible with PCIe
1.x motherboards, using the available bandwidth of PCI Express 1.1.
Overall, graphic cards or motherboards designed for v2.0 will work with
the other being v1.1 or v1.0a."
-> PCIe 2.0 graphics cards are ALSO -> Backward Compatible <- with PCIe
1.0, or 1.1 motherboards.......
-> Using the available bandwidth of PCI Express 1.1
[ PCI Express 2.0 = 500MegaByte per Second, per lane data rate.
PCI Express 1.0 and 1.1 = 250MB/s, per lane data rate.
PCI Express 2.0 = 5.0GigaByte per Second transfer rate
PCI Express 1.0 and 1.1 = 2.5GB/s transfer rate
Will you notice? NO