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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 450 MHz More than 2x higher clock speed
Significantly better PassMark score 1,499 vs 297 More than 5x better PassMark score
Better floating-point performance 1,154.6 GFLOPS vs 95.04 GFLOPS Around 12.2x better floating-point performance
More memory 2,048 MB vs 1,024 MB 2x more memory
Higher texture rate 36.1 GTexel/s vs 7.2 GTexel/s More than 5x higher texture rate
Higher pixel rate 14.43 GPixel/s vs 3.6 GPixel/s More than 4x higher pixel rate
Slightly higher effective memory clock speed 2,002 MHz vs 1,400 MHz Around 45% higher effective memory clock speed
More shading units 640 vs 48 592 more shading units
More texture mapping units 40 vs 16 24 more texture mapping units
Higher memory clock speed 1,001 MHz vs 700 MHz Around 45% higher memory clock speed
More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce GT 325M

Reasons to consider the
Nvidia GeForce GT 325M

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Lower TDP 23W vs 45W Around 50% lower TDP

Benchmarks Real world tests of GeForce GTX 850M vs GT 325M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GTX 850M  vs GT 325M 

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

GeForce GT 325M
22.4 GB/s

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

GeForce GTX 850M
14.43 GPixel/s
GeForce GT 325M
3.6 GPixel/s

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

GeForce GTX 850M
36.1 GTexel/s
GeForce GT 325M
7.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 850M
1,154.6 GFLOPS
GeForce GT 325M
95.04 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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