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Differences What are the advantages of each

Front view of GeForce 940MX

Reasons to consider the
Nvidia GeForce 940MX

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Much higher clock speed 1,122 MHz vs 625 MHz Around 80% higher clock speed
More memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 861.7 GFLOPS vs 240 GFLOPS More than 3.5x better floating-point performance
Higher texture rate 26.93 GTexel/s vs 10 GTexel/s Around 2.8x higher texture rate
Higher pixel rate 8.98 GPixel/s vs 2.5 GPixel/s More than 3.5x higher pixel rate
More shading units 384 vs 96 288 more shading units
Higher memory clock speed 1,001 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce 620M

Reasons to consider the
Nvidia GeForce 620M

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Slightly lower TDP 15W vs 23W Around 35% lower TDP

Features Key features of the GeForce 940MX  vs 620M 

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

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

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

GeForce 940MX
8.98 GPixel/s
GeForce 620M
2.5 GPixel/s

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

GeForce 940MX
26.93 GTexel/s
GeForce 620M
10 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce 940MX
861.7 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 940MX  vs
620M 
GPU brand Nvidia Nvidia
GPU name GM108 GF117
Market Laptop Laptop
Clock speed 1,122 MHz 625 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 384 96
Texture mapping units 24 16
Render output processors 8 8
Pixel rate 8.98 GPixel/s 2.5 GPixel/s
Texture rate 26.93 GTexel/s 10 GTexel/s
Floating-point performance 861.7 GFLOPS 240 GFLOPS

memory

GeForce 940MX  vs
620M 
Memory clock speed 1,001 MHz 900 MHz
Effective memory clock speed 2,002 MHz 1,800 MHz
Memory bus 64 bit 64 bit
Memory 2,048 MB 1,024 MB
Memory type DDR3 DDR3
Memory bandwidth 16.02 GB/s 14.4 GB/s

noise and power

TDP 23W 15W

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