That's a relief. Is it going to be similar to USB 3.0, where you can plug in USB 2.0 but it just wont work as fast a 3.0? or will it perform the same as on a PCIE 3.0 motherboard?
You got it. That's the same idea, yeah.
It'll be at PCIe 2.0 spec speed, but will work perfectly, otherwise. PCIe 2.0 isn't a bottle neck to current PCIe 3.0 cards anyway, so nothing to worry about really.