Comparison of GeForce GT 640M LE and GeForce GT 650M Mac

Attribute	GeForce GT 650M Mac ×	GeForce GT 640M LE ×
GPU
Release year (year)	2012	2012
Reference card	-	Nvidia GeForce GT 640M LE 500 MHz 1 GB
GPU brand	Nvidia	Nvidia
GPU name	GK107	GK107
Market	Laptop	Laptop
Clock speed (MHz)	900	500
Is dual GPU	-	-
Model	GeForce GT 650M Mac	GeForce GT 640M LE
Memory
Memory (MB)	512	1,024
Memory bandwidth (GB/s)	80.3	64
Memory bus (bit)	128	128
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	1,254	1,000
Effective memory clock speed (MHz)	5,016	4,000
Noise and power
TDP (W)	45	20
Raw performance
Pixel rate (GPixel/s)	7.2	4
Render output processors	16	16
Texture mapping units	32	32
Shading units	384	384
Floating-point performance (GFLOPS)	691	384
Texture rate (GTexel/s)	28.8	16
Benchmarks
Battlefield 3	-	8.9
Particle simulation (mInteraction/s)	87.07	-
T-Rex (Compubench 1.5) (frames/s)	0.81	-
Video composition (frames/s)	14.41	-
Dirt3	-	16.8
Face detection (mPixels/s)	8.63	6.49
T-Rex (GFXBench 3.0)	2726.54	2181.42
Manhattan (GFXBench 3.0)	1706.01	1573.09
Bitcoin mining (mHash/s)	13.28	13.95
Sky Diver Factor	-	89.49
Fire Strike Factor	-	14.11
Ocean surface simulation (frames/s)	342.74	-