Neoseeker has posted a tech brief on the new RADEON XT cards that were announced today. Check this out:
The Radeon 9800 XT will come with a core clock of 412 mhz, compared to the 380 on the Radeon 9800 Pro. It will also come with 256 megabytes of RAM running at 712 mhz on a 256-bit memory bus, which is marginally higher than 680 mhz on the Radeon 9800 Pro. Although these increases look marginal, ATi has stated that the XT is more overclockable. Whether this is true or not is up in the air for now.
Check out the rest here. I like the idea of lots of overclocking headroom ;).
