The problem is that SE especially mean "being slower" on newer cards. The GFX companies try to fool us all the time.
With the very new cards "pro" can even mean the slow version. For the x800 its like that, if you want the good model then go for "Xt platinium" or something like that.
Check the last sections of the first page:
http://www.tomshardware.com/graphic/20040504/