On the sidelines of GeForce GTX 680, NVIDIA is working on a fast, cheap, and energy-efficient performance GPU for notebooks, and it's already scoring design wins by the bunches, with notebook manufacturers. PC Perspective got its hands on an Acer Aspire M3 notebook equipped with this chip, and pitted it against notebooks equipped with AMD Radeon HD 6990M, Radeon HD 6720G2, and NVIDIA's own GeForce GT 555M. Intel HD 3000 graphics was also thrown into the cage, for science.All game tests were run at 1366x768 pixels resolution. With 3DMark 06 and DOW 2: Retribution, the GT 640M seemed to be lagging behind the GT 555M, but managed to edge past it, with 3DMark 11, and Battlefield 3. Five of the most popular, current game titles, Battlefield 3, The Elder Scrolls: Skyrim, Deus Ex: Human Revolution, and Batman: Arkham City, were found to be playable at the said resolution, with average frame-rates well over 35 FPS. Find more results at the source.