According to the inquirer nVidia has decided that it doesn't need an Ultra version of the 7800 GTX to compete with R520.

"Nvidia knows that ATI can no ship many R520 XT's running at 600/1400MHz and therefore won't get into relaunching a new faster clocked G70 chip."

According to this article over at hkepc.com R520, or the X1800XT, will be clocked at 650Mhz/1400Mhz and have 16 pipelines. They have a nice picture of the chip so perhaps benchmarks aren't too far off...:)

R520 is getting close. More pictures have surfaced over at techPowerUp! along with some speculation as to the speeds and derivatives that will be available at launch. No closeups of the core this time, full front and back photos for your viewing pleasure:

The ever expanding X800 family got a little bigger recently with the addition of the X800GTO. Performance wise, the X800GTO sits between a vanilla X800GT and the X800XL. At around $200 you definitely get your money's worth. Check out the X800GTO in our database and the first X800GTO review of the card at hardwarezone.