The Inq spotted something about the Radeon X1900 GT:
The reference design is still the same size as X1800/X1900 series, but comes with some tweaks to lower the price of the product. We still see the ancient Rage Theater (sic) ViVo chip, which debuted in the world around eight years ago, and still is an often seen feature on ViVo boards. Sadly, this author has a preference for the Rage Theater (sic) 200 chip instead, but it obviously isn't cheap enough to manufacture.
As you can see, the right side of the PCB has a 6-pin PEG (PCI Express Graphics) connector, and the voltage regulator part has been cleaned due to less power consumption of the chip. However, the size of the die is still huge, and judging by my first check-up, it's not much smaller than R580. It seems to us that the size of caches inside the chip enlarged, or ATI may have a trick or two up its corporate sleevies.