The upcoming RV570XT from ATI will be launched as the Radeon X1900 GT.
ATI is likley to confuse the market with the current plan and we think it will find a way to differentiate the old X1900 GT and the new one, so there might be some more numbers or letters added on.
The cards are codenamed Hellfire 1 and Hellfire 2 and will run at 600 or 650MHz core, depending on the SKU, while the memory will run at 1100MHz. The Hellfire 2 uses GDDR 3 memory with a 256-bit memory interface and its memory runs faster than on Hellfire 1.
Hellfire 2, Radeon X1900GT at 650MHz core and 1100MHz memory is the replacement for Radeon X1900XT that is supposed to phase out slowly.
Hellfire 1 has eight layers PCB and also uses 600 to 650MHz core clock but its memory works at 800MHz and it will probably target the more mainstream market. Both cards are PCIe and support two Dual DVI ports and AVIVO architecture.
These cards should be available in October. More info over here.