I would have said no (or actually, not likely) if I had know it were a 945P 1.x board. Especially if Dell hasn't offered a BIOS update for it within the last 2 or 3 years. But, that info wasn't offered, nor was it the question asked
As a 1.x board, then you can forget about anything AMD unless you go back to the 4000-series (or older) cards. Every
5000-series and 6000-series card is PCIe 2.1. Do not
be fooled by one mislabeled as 2.0, because it is actually 2.1.