Overclockers New Zealand has posted a review on XFX 7900GT and 7600GT Video Cards

Nvidia's 7900GT is an excellent choice for the performance seekers, offering a new level of performance, which is faster than the Nvidia's previous flagship card 7800GTX. This should not come as a surprise to anyone, as the 7900GT is essentially a higher clocked 7800GTX that is built on the advanced 0.09mm manufacturing process. The 7900GT offers an excellent performance/price ratio, with 80~90% of 7900GTX's performance at 3/5 the price.

XFX 7900GT and 7600GT Video Cards Review