Comparison of GeForce GT 640 and NVIDIA Quadro K420

Attribute	GeForce GT 640 ×	NVIDIA Quadro K420 ×
GPU
Release year (year)	2012	2014
Reference card	Nvidia GeForce GT 640 902 MHz 2 GB	-
GPU brand	Nvidia	Nvidia
GPU name	GK107	GK107
Market	Desktop	-
Clock speed (MHz)	902	876
Is dual GPU	-	-
Model	GeForce GT 640	NVIDIA Quadro K420
Memory
Memory (MB)	1,024	1,024
Memory bandwidth (GB/s)	28.8	28.5
Memory bus (bit)	128	128
Memory type	DDR3	DDR3
Memory clock speed (MHz)	900	891
Effective memory clock speed (MHz)	1,800	1,782
Noise and power
TDP (W)	65	41
Load power consumption (W)	208	-
Idle power consumption (W)	104	-
Load noise level (dB)	46.4	-
Idle noise level (dB)	46.4	-
Raw performance
Pixel rate (GPixel/s)	7.22	3.5
SMX units	2	-
Render output processors	16	16
Texture mapping units	32	16
Shading units	384	192
Floating-point performance (GFLOPS)	693	336
Texture rate (GTexel/s)	28.86	14.02
Benchmarks
Metro: Last Light	28	-
Particle simulation (mInteraction/s)	-	66.63
T-Rex (Compubench 1.5) (frames/s)	-	0.38
Video composition (frames/s)	-	10.37
Cloud Gate Factor	12.93	-
Battlefield 4	45	-
Face detection (mPixels/s)	11.31	5.36
Bitcoin mining (mHash/s)	20.86	10.84
Sky Diver Factor	143.75	-
Fire Strike Factor	16.68	-
Ocean surface simulation (frames/s)	209.1	187.37