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Differences What are the advantages of each

Front view of GeForce GTX 860M

Reasons to consider the
Nvidia GeForce GTX 860M

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Better PassMark score 1,719 vs 802 Around 2.2x better PassMark score
Significantly higher effective memory clock speed 5,012 MHz vs 1,800 MHz More than 2.8x higher effective memory clock speed
Higher clock speed 1,020 MHz vs 902 MHz Around 15% higher clock speed
Higher memory bandwidth 80.2 GB/s vs 28.8 GB/s More than 2.8x higher memory bandwidth
Higher turbo clock speed 1,085 MHz vs 936 MHz More than 15% higher turbo clock speed
Significantly higher memory clock speed 1,253 MHz vs 900 MHz Around 40% higher memory clock speed
Front view of GeForce GTX 850A

Reasons to consider the
Nvidia GeForce GTX 850A

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Lower TDP 45W vs 75W 40% lower TDP

Benchmarks Real world tests of GeForce GTX 860M vs 850A

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 860M  vs 850A 

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

GeForce GTX 860M
80.2 GB/s
GeForce GTX 850A
28.8 GB/s

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

GeForce GTX 860M
16.32 GPixel/s
GeForce GTX 850A
14.43 GPixel/s

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

GeForce GTX 860M
40.8 GTexel/s
GeForce GTX 850A
36.1 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 860M
1,305.6 GFLOPS
GeForce GTX 850A
1,154.6 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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