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Differences What are the advantages of each

Front view of GeForce GTX 850A

Reasons to consider the
Nvidia GeForce GTX 850A

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More memory 2,048 MB vs 1,024 MB 2x more memory
Higher texture rate 36.1 GTexel/s vs 16.46 GTexel/s Around 2.2x higher texture rate
More texture mapping units 40 vs 16 24 more texture mapping units
Slightly higher pixel rate 14.43 GPixel/s vs 8.23 GPixel/s More than 75% higher pixel rate
More render output processors 16 vs 8 Twice as many render output processors
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
More shading units 640 vs 384 256 more shading units
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Higher clock speed 1,029 MHz vs 902 MHz Around 15% higher clock speed
Higher turbo clock speed 1,124 MHz vs 936 MHz More than 20% higher turbo clock speed
Higher memory clock speed 1,001 MHz vs 900 MHz More than 10% higher memory clock speed

Benchmarks Real world tests of GeForce GTX 850A vs 840M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 850A  vs 840M 

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

GeForce GTX 850A
28.8 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 850A
14.43 GPixel/s
GeForce 840M
8.23 GPixel/s

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

GeForce GTX 850A
36.1 GTexel/s
GeForce 840M
16.46 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 850A
1,154.6 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

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