Dell has a "learn more" link right next to the card selection that shows the clock speeds (470/660, 20MHz higher stock core speed than the 7900GT and same default memory speed):
And the 7900GS seems to have 20 pixel pipelines, like the 7800GT, from searching around. It should perform between a 7800GT and 7800GTX, but overclock better than either of those.
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