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Been playing around with my x1900 XT this morning and i've come to the conclusion its identical to the x1900 XTX. 
Its got the same RAM 1.1ns, clocks as high as the ati clocking tool will go:
690 Mhz on the Core and 800 Mhz on the Mem. Which is faster than the XTX spec.
Looped 3D Mark for over an hour, played BF2 for nearly 2 hours. Not a hint of any tearing, corruption or anything you would associate with the card being clocked too high or overheating.
So, if i were a betting man, i would hazard a guess that ATI have shipped these cards with the same cores and mem and held back better cores for a future release, say the x1950.
They got badly burned by the 7800GTX and the paper releases of the last cards so i wouldnt be at all surprised to see a new card in the very near future.
Anyway, ill be interested to see what people get when they start playing with the cards.
Rex.
Its got the same RAM 1.1ns, clocks as high as the ati clocking tool will go:
690 Mhz on the Core and 800 Mhz on the Mem. Which is faster than the XTX spec.
Looped 3D Mark for over an hour, played BF2 for nearly 2 hours. Not a hint of any tearing, corruption or anything you would associate with the card being clocked too high or overheating.
So, if i were a betting man, i would hazard a guess that ATI have shipped these cards with the same cores and mem and held back better cores for a future release, say the x1950.
They got badly burned by the 7800GTX and the paper releases of the last cards so i wouldnt be at all surprised to see a new card in the very near future.
Anyway, ill be interested to see what people get when they start playing with the cards.
Rex.