Right, but I know that I can get the XTX speeds with the XT I'm looking at. Here's a link, and check out the reviews. Actually, here are two links, because they're the same card, one is just OEM and the other is retail.
http://www.newegg.com/Product/Product.asp?Item=N82E16814131005
http://www.newegg.com/Product/Product.asp?Item=N82E16814131006
http://www.newegg.com/Product/Product.asp?Item=N82E16814131005
http://www.newegg.com/Product/Product.asp?Item=N82E16814131006