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Differences What are the advantages of each

Front view of GeForce 940M

Reasons to consider the
Nvidia GeForce 940M

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Much higher clock speed 1,072 MHz vs 625 MHz More than 70% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 823.3 GFLOPS vs 240 GFLOPS Around 3.5x better floating-point performance
Higher texture rate 25.73 GTexel/s vs 10 GTexel/s More than 2.5x higher texture rate
Slightly higher pixel rate 8.58 GPixel/s vs 2.5 GPixel/s Around 3.5x higher pixel rate
More shading units 384 vs 96 288 more shading units
Front view of GeForce 620M

Reasons to consider the
Nvidia GeForce 620M

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Slightly lower TDP 15W vs 33W 2.2x lower TDP

Features Key features of the GeForce 940M  vs 620M 

memory bandwidth Rate at which data can be read from or stored in onboard memory

GeForce 940M
14.4 GB/s
GeForce 620M
14.4 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

GeForce 940M
8.58 GPixel/s
GeForce 620M
2.5 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

GeForce 940M
25.73 GTexel/s
GeForce 620M
10 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 940M
823.3 GFLOPS
GeForce 620M
240 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

Specifications Full list of technical specs

gpu

GeForce 940M  vs
620M 
GPU brand Nvidia Nvidia
GPU name GM108 GF117
Market Laptop Laptop
Clock speed 1,072 MHz 625 MHz
Is dual GPU No No
Reference card Nvidia GeForce 940M 1 GHz 2 GB None

raw performance

Shading units 384 96
Texture mapping units 24 16
Render output processors 8 8
Pixel rate 8.58 GPixel/s 2.5 GPixel/s
Texture rate 25.73 GTexel/s 10 GTexel/s
Floating-point performance 823.3 GFLOPS 240 GFLOPS

memory

GeForce 940M  vs
620M 
Memory clock speed 900 MHz 900 MHz
Effective memory clock speed 1,800 MHz 1,800 MHz
Memory bus 64 bit 64 bit
Memory 2,048 MB 1,024 MB
Memory type DDR3 DDR3
Memory bandwidth 14.4 GB/s 14.4 GB/s

noise and power

TDP 33W 15W

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