I have an Intel S5000PSL motherboard that has a PCIe 1.0 slot that I want to use a Sapphire HD 5770 video card in. However, although the PCIe 2.0 specification requires devices to be backwards compatible it seems that there is an issue with the backwards compatibility of the HD 5xxx series cards and PCIe 1.0 - the computer will not POST with the card installed.
I've looked around and don't see a quick fix for this, but is there any chance an updated video BIOS could fix that issue?
Updated GPU BIOSs wouldn't have any effect as far as I am aware since those are more for UEFI or legacy BIOS support. It isn't just about PCIe 1.x & 2.0 being backwards compatible the motherboard Chipset and BIOS play a part too. Some intel motherboards got updated BIOSs in 2013 to support the GPUs which were available at the time. Check to see if there is an update from Intel. Otherwise you would most likely need a newer motherboard.