The requirement that worry's me
"PCI Express-compliant motherboard with one dual-width x 16 graphics slot"
I DO know that my board has a PCI-E slot, but I'm not sure what they mean by "dual-width x 16 graphics slot"
If it helps, my PC is an e-machines EL1850.
And don't worry, I know the PSU in that is crap and tiny and useless, and that this card wouldn't fit in the case anyway.
But I've taken care of both those problems. (Already got the new case, just deciding on the PSU now)