Anyone know the answer to this?
The "Official" PCI sig position is that they're compatible. The reality is somewhat more complicated. NVIDIA PCI-Express 2.0 video cards sometimes do not work with PCI-Express 1.0 motherboards. ATI PCI-Express 2.0 video cards do work with PCI-Express 1.0 motherboards. Both NVIDIA and ATI PCI-Express 2.0 video cards do work with PCI-Express 1.1 motherboards. You can see some basics on this subject here and here.A PCIe 2.0 video card is backward compatible with a PCIe 1.0 expansion slot. It will work. :smile: