ATI has released its two new top of line graphics cards yesterday and they are somking out nVidia.  Don't mean to diss nVidia, but the ATI has a two month gain over nVidia in technology.  The x1900 xt has a 1450mhz memory clock and a 625 mhz core clock those speeds are a little slower than the x1800 xt, but the x1900 xt still is more powerful in games thanks to the 48 pixel shaders in the R580 gpu, that is double of the nVidia 7800 gtx.  The ATI x1900 xtx has a 1550 mhz memory clock and a 650 mhz core clock.   The speeds will likely increase in games with these cards in the future, after a few more drivers are released from ATI.  Prices are steep at $519 for the x1900 xt and $600 for the x1900 xtx and those are OEM prices.  The nVidia 7900 is scheduled for March to be released and it  will probably put an end to ATI's 2 month lead.