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Differences What are the advantages of each

Front view of GeForce GT 720M

Reasons to consider the
Nvidia GeForce GT 720M

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Slightly lower TDP 33W vs 45W More than 25% lower TDP
Front view of GeForce 820M

Reasons to consider the
Nvidia GeForce 820M

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Higher clock speed 810 MHz vs 625 MHz Around 30% higher clock speed
Higher texture rate 25.9 GTexel/s vs 10 GTexel/s More than 2.5x higher texture rate
Better floating-point performance 622.1 GFLOPS vs 240 GFLOPS More than 2.5x better floating-point performance
Higher memory bandwidth 28.8 GB/s vs 12.8 GB/s 2.2x higher memory bandwidth
Higher pixel rate 6.48 GPixel/s vs 2.5 GPixel/s More than 2.5x higher pixel rate
More render output processors 16 vs 8 Twice as many render output processors
More shading units 384 vs 96 288 more shading units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
More texture mapping units 32 vs 16 Twice as many texture mapping units
Higher memory clock speed 901 MHz vs 800 MHz Around 15% higher memory clock speed

Features Key features of the GeForce GT 720M  vs 820M 

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

GeForce GT 720M
12.8 GB/s
GeForce 820M
28.8 GB/s

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

GeForce GT 720M
2.5 GPixel/s
GeForce 820M
6.48 GPixel/s

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

GeForce GT 720M
10 GTexel/s
GeForce 820M
25.9 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 720M
240 GFLOPS
GeForce 820M
622.1 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 GT 720M  vs
820M 
GPU brand Nvidia Nvidia
GPU name GF117 GK107
Market Laptop Laptop
Clock speed 625 MHz 810 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 96 384
Texture mapping units 16 32
Render output processors 8 16
Pixel rate 2.5 GPixel/s 6.48 GPixel/s
Texture rate 10 GTexel/s 25.9 GTexel/s
Floating-point performance 240 GFLOPS 622.1 GFLOPS

memory

GeForce GT 720M  vs
820M 
Memory clock speed 800 MHz 901 MHz
Effective memory clock speed 1,600 MHz 1,802 MHz
Memory bus 64 bit 128 bit
Memory 2,048 MB 2,048 MB
Memory type DDR3 DDR3
Memory bandwidth 12.8 GB/s 28.8 GB/s

noise and power

TDP 33W 45W

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