NVIDIA GeForce GT 640M: specs and benchmarks
NVIDIA started GeForce GT 640M sales 22 March 2012. This is Kepler architecture notebook card based on 28 nm manufacturing process and primarily aimed at gamers. 2 GB of DDR3\GDDR5 memory clocked at 1.8 GHz are supplied, and together with 128bit memory interface this creates a bandwidth of Up to 64.0 GB/s.
Compatibility-wise, this is card attached via PCIe 3.0 x16 interface. Power consumption is at 32 Watt.
It provides poor gaming and benchmark performance at 5.78 percent of a leader's which is AMD Radeon R9 390 X2.