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Differences What are the advantages of each

Front view of GeForce GTX 950M

Reasons to consider the
Nvidia GeForce GTX 950M

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Much higher clock speed 993 MHz vs 500 MHz Around 2x higher clock speed
Significantly more memory 4,096 MB vs 1,024 MB 4x more memory
Better floating-point performance 1,271 GFLOPS vs 240 GFLOPS More than 5.2x better floating-point performance
More shading units 640 vs 96 544 more shading units
Slightly higher pixel rate 15.89 GPixel/s vs 10 GPixel/s Around 60% higher pixel rate
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 900 MHz vs 800 MHz Around 15% 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 1,800 MHz Around 80% higher effective memory clock speed
Much better T-Rex score 3,354.5 vs 1,679.86 Around 2x better T-Rex score
Higher memory bandwidth 51.2 GB/s vs 28.8 GB/s Around 80% higher memory bandwidth
Lower TDP 28W vs 75W 2.7x lower TDP

Benchmarks Real world tests of GeForce GTX 950M vs GTS 250M

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Features Key features of the GeForce GTX 950M  vs GTS 250M 

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

GeForce GTX 950M
28.8 GB/s
GeForce GTS 250M
51.2 GB/s

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

GeForce GTX 950M
15.89 GPixel/s
GeForce GTS 250M
10 GPixel/s

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

GeForce GTX 950M
39.7 GTexel/s
GeForce GTS 250M
40 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 950M
1,271 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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