Digit-Life posted a review on the HIS RADEON HD 2900 PRO 512MB video card
A quote from the article:
HIS RADEON HD 2900 PRO 512MB Review
We are surprised to see a modification of RADEON HD 2900 XT at $249 instead of $449. That is, the GPU clock was reduced by 150 MHz, memory was left almost untouched. And voila - meet the 2900 PRO, cheaper by $200. Even without tests it's clear that such a product can be extremely popular.
HIS RADEON HD 2900 PRO 512MB Review