Whereas with the 6800 series where the GT, bar clock speeds, was the same as the Ultra, the 7800 GT does have some architectural differences to the GTX. The major one is that the GT has 20 pixel pipelines, rather than the 24 of the GTX and seven vertex shaders instead of eight. Clock speeds have been reduced too with the core running at 400MHz compared to 430MHz for the GTX and the memory at 1,000MHz compared to 1,250MHz. That said the two retail GTX boards we’ve looked at from XFX and AOpen were both unning at 450/1250MHz for core and memory so it’s not unreasonable to expect many retail GT boards to also offer a ‘free’ boost.