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Originally Posted by Yan Wang
Tristan, in benchmarks, the GDDR3 version could often keep up with or beat the X800 mobile in performance while the DDR1 version lagged at a little more than half the performance. BIG difference.
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I just checked: the clock speeds of the GPUs themselves are different (250 MHz vs. 330 MHz), in addition to the different memory speeds.
That ought to account for much of the difference. The 6800s both have the same basic architecture, though.