well lets see its a 450W power supply with a 32A 12V rail. 6 fans would take ~2-3 amps, leaving you lets say 29A on the 12v, so 12x29 = 348 watts, the max wattage of your gpu is around 140W, and you cpu is around 80W so that, let's say redlining your rig would be 220W so youd be left with lets say 120W, plenty to power your HD's as well as a healthy OC. now down the road you might run into a issue, if you sli/add a few too many accessories, but as for now you're good to go.
awesome thanks for the explanation!!