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Differences What are the advantages of each

Front view of GeForce GTX 850M

Reasons to consider the
Nvidia GeForce GTX 850M

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Much higher clock speed 902 MHz vs 500 MHz More than 80% higher clock speed
Better floating-point performance 1,154.6 GFLOPS vs 240 GFLOPS More than 4.8x better floating-point performance
More memory 2,048 MB vs 1,024 MB 2x more memory
More shading units 640 vs 96 544 more shading units
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 1,001 MHz vs 800 MHz More than 25% higher memory clock speed
Front view of GeForce GTS 250M

Reasons to consider the
Nvidia GeForce GTS 250M

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Higher effective memory clock speed 3,200 MHz vs 2,002 MHz Around 60% higher effective memory clock speed
Slightly higher memory bandwidth 51.2 GB/s vs 32 GB/s More than 60% higher memory bandwidth
Slightly lower TDP 28W vs 45W Around 40% lower TDP

Benchmarks Real world tests of GeForce GTX 850M vs GTS 250M

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Features Key features of the GeForce GTX 850M  vs GTS 250M 

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

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

GeForce GTX 850M
14.43 GPixel/s
GeForce GTS 250M
10 GPixel/s

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

GeForce GTX 850M
36.1 GTexel/s
GeForce GTS 250M
40 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 850M
1,154.6 GFLOPS
GeForce GTS 250M
240 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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