Neoseeker has published a review of XFX's 8600 GT XXX card

In our more recent benchmarks, the limits of the 128-bit memory bus start to shows its sign. The X1950 Pro is the only card in this lineup with 256-bit memory busses and it shows as its scores sweep away from the rest of the field. The disparity of scores with these newer games really exemplifies the weakness of the G84's 128bit memory with next generation games. On the other hand, the above illustrates another point: those of you using 6600 GT class cards are woefully underpowered for playing next generation games at even 1024x768 with NO filtering or anti-aliasing features enabled.

Neoseeker XFX 8600 GT XXX Review