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Differences What are the advantages of each

Front view of GeForce GTX 850M

Reasons to consider the
Nvidia GeForce GTX 850M

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Higher clock speed 902 MHz vs 608 MHz Around 50% higher clock speed
Much lower TDP 45W vs 215W 4.8x lower TDP
Higher memory clock speed 1,001 MHz vs 837 MHz Around 20% higher memory clock speed
Front view of GeForce GTX 470 PhysX

Reasons to consider the
Nvidia GeForce GTX 470 PhysX

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Higher memory bandwidth 133.9 GB/s vs 32 GB/s Around 4.2x higher memory bandwidth
Higher effective memory clock speed 3,348 MHz vs 2,002 MHz More than 65% higher effective memory clock speed
Higher pixel rate 34.02 GPixel/s vs 14.43 GPixel/s More than 2.2x higher pixel rate
More render output processors 40 vs 16 24 more render output processors
Higher texture rate 68.04 GTexel/s vs 36.1 GTexel/s Around 90% higher texture rate
Wider memory bus 320 bit vs 128 bit 2.5x wider memory bus

Features Key features of the GeForce GTX 850M  vs 470 PhysX 

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

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

GeForce GTX 850M
14.43 GPixel/s
GeForce GTX 470 PhysX
34.02 GPixel/s

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

GeForce GTX 850M
36.1 GTexel/s
GeForce GTX 470 PhysX
68.04 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 850M
1,154.6 GFLOPS
GeForce GTX 470 PhysX
1,089 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 GTX 850M  vs
470 PhysX 
GPU brand Nvidia Nvidia
GPU name GM107 GF100
Market Laptop Desktop
Clock speed 902 MHz 608 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 640 448
Texture mapping units 40 56
Render output processors 16 40
Pixel rate 14.43 GPixel/s 34.02 GPixel/s
Texture rate 36.1 GTexel/s 68.04 GTexel/s
Floating-point performance 1,154.6 GFLOPS 1,089 GFLOPS

memory

GeForce GTX 850M  vs
470 PhysX 
Memory clock speed 1,001 MHz 837 MHz
Effective memory clock speed 2,002 MHz 3,348 MHz
Memory bus 128 bit 320 bit
Memory 2,048 MB 1,280 MB
Memory type DDR3 GDDR5
Memory bandwidth 32 GB/s 133.9 GB/s

noise and power

TDP 45W 215W

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