The performance gain between this generation and the last is substantial. Overall, the GT 640 appears to offer performance on par with the old GT 555M. This should have the effect of lowering the money you have to spend to buy a laptop with acceptable 3D performance. Our Acer Aspire review unit has an MSRP of $799, which is quite a bit less than systems available with the GT 555M."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips