Video Card Compatibility Question?

I have a compaq presario sr5710y and i want to upgrade the graphics card to a ATI Radeon HD 6870. I know i have to upgrade my PSU but my PCI express x16 is not 2.0. Does it have to be 2.0 so that the card works with my motherboard or can i just install the PSU and graphics card and it will work?|||Make sure the dimensions fit in the PC, newer cards are quite large, had a whole debate about that last answer LOL But yea even if it's not 2.0 it should work fine, you can actually put a GPU in any PCIe slot but the x16 is obviously faster, some people that want to crossover or SLi, will put the more powerful card on the x16 and the lower card on a regulard PCIe x 1. That 6870 is a hefty card, make sure the PSU is rated high enough for it, I think you need a min of 600w, so you'll need at least a 650-700w to fully power the system. Too much wattage on a PSU is better than not enough, an underpowered system will burn out the main board. 2.0 is really just the version number, just means it's newer than an 07 system with a regulard pciex16 slot. New PSU, check dimensions and install card, and I don't see you having many problems. Make sure to delete all your previous video drivers, new video cards don't like old driver files.