Comparison of GeForce 840M and GeForce 830M

Attribute	GeForce 840M ×	GeForce 830M ×
GPU
Release year (year)	2014	2014
GPU brand	Nvidia	Nvidia
GPU name	GM108	GM108
Market	Laptop	Laptop
Clock speed (MHz)	1,029	1,082
Turbo clock speed (MHz)	1,124	1,150
Is dual GPU	-	-
Model	GeForce 840M	GeForce 830M
Memory
Memory (MB)	1,024	2,048
Memory bandwidth (GB/s)	16	14.4
Memory bus (bit)	64	64
Memory type	DDR3	DDR3
Memory clock speed (MHz)	1,001	900
Effective memory clock speed (MHz)	2,002	1,800
Noise and power
TDP (W)	33	33
Raw performance
Pixel rate (GPixel/s)	8.23	8.66
Render output processors	8	8
Texture mapping units	16	16
Shading units	384	256
Floating-point performance (GFLOPS)	790	554
Texture rate (GTexel/s)	16.46	17.31
Benchmarks
Bioshock Infinite	-	12.3
Battlefield 4	11.2	9.5
Face detection (mPixels/s)	22.54	16.95
T-Rex (GFXBench 3.0)	3359.62	3361.16
Manhattan (GFXBench 3.0)	1855.62	1851.27
Bitcoin mining (mHash/s)	94.68	67.44
Sky Diver Factor	120.22	127.48
Thief	9.1	-
Fire Strike Factor	12.59	12.69