Help evaluate my PC Rig for GPU upgrade

[Arkaign]

How much more power does a 6870 use though?

Not enough to be a concern unless the PSU is terrible to begin with. Probably 15W at most, though overclocking will change that. But 6850 OC ~= Stock 6870 in both power draw and performance.

 

[Hav0k99]

CPU-Z shows my CPU at 6x instead of 8x...?!!? In the bios I have it set to 400 and when I boot into windows it shows as 6x400fsb

 

[Hav0k99]

So If I go up to 6870 w/ no OC of the processor will I see a big performance improvement?

 

[exar333]

So If I go up to 6870 w/ no OC of the processor will I see a big performance improvement?

Yes, substantial. If you can squeeze a few more Mhz out of your CPU, that never hurts...