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Differences What are the advantages of each

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 16.02 GB/s More than 8.2x 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 8.23 GPixel/s Around 4.2x higher pixel rate
Significantly more render output processors 40 vs 8 32 more render output processors
Higher texture rate 68.04 GTexel/s vs 16.46 GTexel/s Around 4.2x higher texture rate
More texture mapping units 56 vs 16 40 more texture mapping units
Wider memory bus 320 bit vs 64 bit 5x wider memory bus
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Significantly higher clock speed 1,029 MHz vs 608 MHz Around 70% higher clock speed
Much lower TDP 33W vs 215W 6.5x lower TDP
Higher memory clock speed 1,001 MHz vs 837 MHz Around 20% higher memory clock speed

Features Key features of the GeForce GTX 470 PhysX  vs 840M 

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

GeForce 840M
16.02 GB/s

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

GeForce GTX 470 PhysX
34.02 GPixel/s
GeForce 840M
8.23 GPixel/s

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

GeForce GTX 470 PhysX
68.04 GTexel/s
GeForce 840M
16.46 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 470 PhysX
1,089 GFLOPS
GeForce 840M
790.3 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 470 PhysX  vs
840M 
GPU brand Nvidia Nvidia
GPU name GF100 GM108
Market Desktop Laptop
Clock speed 608 MHz 1,029 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 448 384
Texture mapping units 56 16
Render output processors 40 8
Pixel rate 34.02 GPixel/s 8.23 GPixel/s
Texture rate 68.04 GTexel/s 16.46 GTexel/s
Floating-point performance 1,089 GFLOPS 790.3 GFLOPS

memory

GeForce GTX 470 PhysX  vs
840M 
Memory clock speed 837 MHz 1,001 MHz
Effective memory clock speed 3,348 MHz 2,002 MHz
Memory bus 320 bit 64 bit
Memory 1,280 MB 1,024 MB
Memory type GDDR5 DDR3
Memory bandwidth 133.9 GB/s 16.02 GB/s

noise and power

TDP 215W 33W

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