Looks real to me. The reason you didn't find anything on ATI.COM is that the board product in that auction isn't from ATI. It's a card from Peak, built using an ATI chip. The board does look like a reference design though and I know the reference design allows for 256MB.
The 9600 is a decent mainstream asic. However, might want to look around at some discounted 9800 prices on the net recently.
Damn, I just realised I missed two auctoins I was watching on eBay today. Cooked myself an amazing steak tonight but forgot to log on to the computer. Damn stomach!
Bruno