We start off with 3DMark Vantage as a quick gauge on where these graphics cards stand. As expected, the Sapphire Radeon HD 6670 was ahead of the rest, with close to 3000 3DMarks at Extreme. It was around 20% faster than the 6570, which is quite logical when you account for the discrepancy between their core clocks (800MHz vs 650MHz). With the older Radeon HD 5670 just a notch behind the 6570, one could say that the Turks represent a decent amount of progress.
At the bottom of the heap was the Radeon HD 6450, which was much slower than the GT 520 (which in itself is actually not better than a GeForce GT 220) . With the older but price competitive GT 430 still around, it's really hard to see where the newer GT 520 and Radeon HD 6450 stand. They are not much better than the best IGP units around.