^
Read this
"Due to a clock speed of just 500 MHz, the gaming performance of the GeForce GT 640M LE should be about 20 percent below the 640M. This would be the same level as the GT 635M or the GT 555M. The performance is exceptionally good in shader-heavy DirectX 11 games and benchmarks. However, the 128-Bit memory interface can be a bottleneck if DDR3 graphics memory is used. Demanding games of 2011 like Battlefield 3 will be playable in 1366x768 and medium settings."
NVIDIA GeForce GT 640M LE - Notebookcheck.net Tech
I know man, it has been written before launch with rumors and all, see in writing they use would be or will not is or has. Also they have written:
Watch out: Following rumors, there will also be a Fermi-based version (96 shaders, 762 MHz, DDR3/GDDR5, similar to 550M/555M) with a probably higher power consumption than the Kepler variant.
Battlefield is playable in 1366x768 with medium settings and performance would not that great if he will play in native resolution that is 1920x1080.
That list has been updated properly, and more trustful.
In 3D mark site benchmarks all are almost same. But spec wise 6770M is the best. (that list in according to it)
*img823.imageshack.us/img823/5701/ssscxw.jpg