i think the x700 family and below are weak compared to the 6600.
Except for that would be incorrect. The X700 is better thna the GF6600, the GF6600<b>GT</b> is arguably better than the X700PRO. But we're not talking about the GT versus PRO/XT, and even more so we're not talking about about desktop cards.
The GF6600 has about the same fillrate and memory bandwidth, but the X700 has twice the Vertex power (6 vs 3 pipes).
For all the advantages each has, that one has me convinced as to the tie-breaker (geometric instancing ring a bell?). I recently recommended the GF6800 version to a friend saying it would likely be faster in almost all games, and in most likely be about 40% faster, however the GF6600 is not it's bigger brother and in this case would be the lesser of the 2, but even then they are still both very close.
Some reviews of the X700 tech and in action;
<A HREF="http://www.firingsquad.com/hardware/mobility_radeon_x700/" target="_new">http://www.firingsquad.com/hardware/mobility_radeon_x700/</A>
<A HREF="http://www.firingsquad.com/hardware/acer_mobility_8100/" target="_new">http://www.firingsquad.com/hardware/acer_mobility_8100/</A>
Truely either would be fine, personal choice is one thing, but the X700 is far from weak in either desktop (where it dominates) or laptop form. There is no GT here.
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