I was more concerned with seeing if the 2600XT was a good buy, rather than concentrating on the difference a 10% memory clockspeed difference makes.
All of the 2600 XT's I can find under $130 have 700 MHz memory. The 800 MHz models - as well as the GDDR4 models - are priced too high to matter, because they're butting heads with the X1950 PRO which will kill them. Because of this, the 800 MHz models are irrelevant as far as a purchase option.
Having said all that, If I had one lying around the lab I would have included benches for it, but I didn't consider it a priority. If this article has a large response though, I'll try to do a follow up article about the DDR2 8600 GTs, and I'll include both 8600 GTs as well as the different flavors of 2600 XTs (even the GDDR4 version) out there if I can get my hands on em.