The X800GT will feature eight pipelines and is based on the 110nm R430PRO chip. It will come with both 128MB and 256MB and features a 256 bit memory interface. The core will be clocked at 392MHz and the GDDR3 or DDR1 memory at 700MHz. It's a PCI Express 16x part but ATI should be able to create an AGP version with its Rialto bridge chip.
The card will look like the standard X800 card but will be cheaper. The X800 with 12 pipelines costs less than 200EUR so it's a safe guess the X800GT will even be cheaper. The Inquirer believes ATI wants this card to put some pressure on NVIDIA's GeForce 6600GT.