I have an hp xw8600 workstation. 2 xeon e5410 cpus, 10 gb ram, 800 watt psu. I am trying to upgrade the graphics to run some games. It came with 2 NVidia Quadro fx 1700's. (ancient, I know.) So I went and bought and xfx r7 260x DD edition. Couldn't get it to work. 6 beeps with red lights. exchanged for another unit, same issue. Does anyone know what I need to do to get this card to work? or if not, what card can I get for the same price ($140 USD.) That WILL work in my system? And yes, the 6 pin was plugged in.