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Differences What are the advantages of each

Front view of GeForce GTX 460 X2

Reasons to consider the
Nvidia GeForce GTX 460 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Much higher memory bandwidth 230.4 GB/s vs 16.02 GB/s Around 14.5x higher memory bandwidth
Many more render output processors 64 vs 8 56 more render output processors
Higher effective memory clock speed 3,600 MHz vs 2,002 MHz Around 80% higher effective memory clock speed
Significantly more texture mapping units 112 vs 16 96 more texture mapping units
Higher texture rate 78.6 GTexel/s vs 16.46 GTexel/s More than 4.8x higher texture rate
Better floating-point performance 1,883 GFLOPS vs 790.3 GFLOPS Around 2.5x better floating-point performance
Slightly more memory 2,048 MB vs 1,024 MB 2x more memory
Higher pixel rate 19.62 GPixel/s vs 8.23 GPixel/s Around 2.5x higher pixel rate
Wider memory bus 512 bit vs 64 bit 8x wider memory bus
Slightly more shading units 672 vs 384 288 more shading units
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Significantly higher clock speed 1,029 MHz vs 701 MHz More than 45% higher clock speed
Significantly lower TDP 33W vs 160W 4.8x lower TDP
Slightly higher memory clock speed 1,001 MHz vs 900 MHz More than 10% higher memory clock speed

Features Key features of the GeForce GTX 460 X2  vs 840M 

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

GeForce GTX 460 X2
230.4 GB/s
GeForce 840M
16.02 GB/s

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

GeForce GTX 460 X2
19.62 GPixel/s
GeForce 840M
8.23 GPixel/s

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

GeForce GTX 460 X2
78.6 GTexel/s
GeForce 840M
16.46 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 460 X2
1,883 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 460 X2  vs
840M 
GPU brand Nvidia Nvidia
GPU name GF104 GM108
Market Desktop Laptop
Clock speed 701 MHz 1,029 MHz
Is dual GPU Yes No
Reference card None None

raw performance

Shading units 672 384
Texture mapping units 112 16
Render output processors 64 8
Pixel rate 19.62 GPixel/s 8.23 GPixel/s
Texture rate 78.6 GTexel/s 16.46 GTexel/s
Floating-point performance 1,883 GFLOPS 790.3 GFLOPS

memory

GeForce GTX 460 X2  vs
840M 
Memory clock speed 900 MHz 1,001 MHz
Effective memory clock speed 3,600 MHz 2,002 MHz
Memory bus 512 bit 64 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 DDR3
Memory bandwidth 230.4 GB/s 16.02 GB/s

noise and power

TDP 160W 33W

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