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Differences What are the advantages of each

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
Higher memory bandwidth 51.2 GB/s vs 16.02 GB/s Around 3.2x higher memory bandwidth
Higher texture rate 40 GTexel/s vs 16.46 GTexel/s Around 2.5x higher texture rate
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
More texture mapping units 32 vs 16 Twice as many texture mapping units
Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Much higher clock speed 1,029 MHz vs 500 MHz More than 2x higher clock speed
Better floating-point performance 790.3 GFLOPS vs 240 GFLOPS More than 3.2x better floating-point performance
More shading units 384 vs 96 288 more shading units
Higher memory clock speed 1,001 MHz vs 800 MHz More than 25% higher memory clock speed

Benchmarks Real world tests of GeForce GTS 250M vs 840M

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
3,361.92

Features Key features of the GeForce GTS 250M  vs 840M 

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

GeForce GTS 250M
51.2 GB/s
GeForce 840M
16.02 GB/s

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

GeForce GTS 250M
10 GPixel/s
GeForce 840M
8.23 GPixel/s

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

GeForce GTS 250M
40 GTexel/s
GeForce 840M
16.46 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTS 250M
240 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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