It won't matter what the Xeon 5500 series parts, the X58 parts, or any specific board can do. It's in the PCIe specs, and is hardwired into the PCIe controller bus.
Fortunately, the newer versions are/will be backward compatible. So if you manage to get a board that's strictly PCIe 2.0, your PCIe 1.1 cards will still work.![]()
LOL WOW