NVIDIA GeForce GT 640M Mac Edition: specs and benchmarks
NVIDIA started GeForce GT 640M Mac Edition sales 3 February 2013. This is Kepler architecture desktop card based on 28 nm manufacturing process and primarily aimed at office use. 0.5 GB of GDDR5 memory clocked at 5 GHz are supplied, and together with 64 Bit memory interface this creates a bandwidth of 40 GB/s.
Compatibility-wise, this is card attached via PCIe 3.0 x16 interface. No additional power connector is required, and power consumption is at 32 Watt.
It provides poor gaming and benchmark performance at 0.98 percent of a leader's which is AMD Radeon R9 390 X2.