Hello everyone, and thanks in advance for any help you can offer me. I have an Asus M4A77D mobo, BIOS v2201, Chipset RX780-SB700, AMI with a PCI Express 2.0x16 slot. The mobo is working well, but I'm not happy with the PCIE 2.0 card, and was wondering if a 3.0 card would work in the 2.0 slot. I went on the Asus website, but they have discontinued support for this board, so I came here for advice. I have done a little snooping around, and there appears to be mixed opinions as to whether or not this is a good idea, so I came here hoping for a more definative answer........ As far as I know the BIOS and Chipset are the latest. OS is WinXP SP2. Thanks again. Chris