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Differences What are the advantages of each

Front view of GeForce GT 420M

Reasons to consider the
Nvidia GeForce GT 420M

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Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of GeForce 405M

Reasons to consider the
Nvidia GeForce 405M

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Higher clock speed 606 MHz vs 500 MHz More than 20% higher clock speed

Features Key features of the GeForce GT 420M  vs 405M 

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

GeForce GT 420M
25.6 GB/s
GeForce 405M
12.8 GB/s

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

GeForce GT 420M
4 GPixel/s
GeForce 405M
2.42 GPixel/s

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

GeForce GT 420M
16 GTexel/s
GeForce 405M
4.85 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 420M
192 GFLOPS
GeForce 405M
38.78 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 420M  vs
405M 
GPU brand Nvidia Nvidia
GPU name GF108 GT218
Market Laptop Laptop
Clock speed 500 MHz 606 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 96 16
Texture mapping units 16 8
Render output processors 4 4
Pixel rate 4 GPixel/s 2.42 GPixel/s
Texture rate 16 GTexel/s 4.85 GTexel/s
Floating-point performance 192 GFLOPS 38.78 GFLOPS

memory

GeForce GT 420M  vs
405M 
Memory clock speed 800 MHz 800 MHz
Effective memory clock speed 1,600 MHz 1,600 MHz
Memory bus 128 bit 64 bit
Memory 512 MB 512 MB
Memory type DDR3 GDDR3
Memory bandwidth 25.6 GB/s 12.8 GB/s

noise and power

TDP 23W 14W

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