does the concept of explaining his question to him, instead of flaming him, seem to be lost on you people?
the only actual statement in here that is remotely correct or even makes sense in plain english, is the X1800XT and 7800GTX doing different in different benchmarks (wow, you think they might do different, given the amazingly GIGANTIC architectual differences, paired with driver maturity differences, and optimizations for different engines, along with using different memory systems and pipeline configurations, i'm so amazed they aren't identical </sarcasm>
as to the remarks about the 7800GTX 512MB, it's been for sale on and off for most of decemeber, newegg just isn't stocking it (you know there are something like a thousand other retailers...newegg isn't the only one, just one of many) or doesn't have it in stock
The guy is simply asking why the X1800XT and X1800XL are even selling, well it simply comes down to people being so blindly devoted to ATI that they'll buy them, or that they just have to have the newest out there (it is newer than 7800, by a few months)
The X1800 series launched late, and didn't offer as much performance as the hype promised, while the 7800 was announced and launched almost overnight, and really is an amazing card...
So if your wanting to say going for a brand with a more mature platform for most technologies ATI is competing with, is heathenistic (as would be implied by your amazingly newbie friendly posts) then I think you sir are the heathen....
Also, while I can't vouch for the nVidia Forums, I can certainly say that this abomination of a forum is not only an amazingly hostile place, but it's a disapointment to what used to be a somewhat respected tech website (believe me, THG doesn't have the best reputation, and your wonderful hospitality is obviously improving the reputation of the most legitimate and never questioned authority on hardware performance on the net...)