The GeForce GT640M use the Nvidia Kepler GK107 GPU using TSMC 28nm process technology to build it, core run at 624Mhz and 384 stream processors running @ 1248MHz and a 128-bit bus interconnected with 2GB of 1800MHz DDR3, specifications are interesting for a mobile device, the Acer Aspire Timeline Ultra M3 laptop cost $799.
Benchmark snapshot selection:
3DMark 2011 Benchmark result GT 640M Vs GT 555M:
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