yeah I know but I was more worried about the power draw. While the 6670 runs fine on some 300w psu but the psu has to be modern and I think the one op has is a bit old. The 6570 works fine on my hp slimline with 220w so I thought it was the safest bet. Either card will be a huge upgrade from the integrated graphics op has.
A 6670 on a 300w with only a dual core would be fine. We're only talking around a 10-20w difference between the 2. And the 6670 has better VRAM bandwidth, pixel fillrate, and texture rate. And at low-end cards, those are all performance limiters (not like high end cards where Pixel fillrate has hit a wall since it doesn't need to get higher, 32 ROP's is fine).