Oddly enough, even though the X800GT got incredible resentment from the majority of our readers, the fact is that ATI sold a ton of chips in a very short period of time. So much so that Tier 1 partners are having trouble securing more chips, which is probably the primary reason why X800GTO showed up on the radar. A few Tier 1 guys that we all know and love are actually countering the X800GT with extremely favorably clocked 256MB X800 vanilla cards instead. An X800 vanilla running at say, 800MHz memory clock would still not be able to match the memory bandwidth of a near-1000MHz GDDR3 X800GT, but the additional pipes give it a much better fill rate. More details on that in the near future as well...
From Anandtech
From Anandtech