techPowerUp! posted a review on the ATI Radeon X1900 XT 256 MB

ATI's new X1900 XT 256 MB is designed to fit into the price range that is bound by the X1900 GT on the lower end and the X1900 XT 512 MB on the upper end. In order to bring the card's price down ATI chose to reduce the total memory size from 512 MB to 256 MB. Also a bit slower memory is used. We test how big the performance difference to the more expensive X1900 XTX with 512 MB is.

ATI Radeon X1900 XT 256 MB Review