The bottom line here is that it all comes down to price. With the close competition at the high end, we still really don't recommend the X1900 XTX which generally comes in between $580 and $650. In order for the 7900 GTX to really look good compared to the X1900 XT, we will have to push below the $500 mark. NVIDIA has positioned the 7900 GTX as a $500 part, but we can already find X1900 XT cards for about $475; with the tight competition, we would really like to see NVIDIA take advantage of their cost saving die sizes and bring prices down.
The NVIDIA solutions use less power, generate less heat, and are cheaper to produce. But what matters in the end is the performance the end user gets for the price he or she pays. Yes, the 7900 GTX performs on par with the X1900 XT and XTX. But with ATI's additional features, will NVIDIA's street prices be low enough to entice gamers? We'll have to wait and see.