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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 1,800 MHz Around 80% higher effective memory clock speed
Higher memory bandwidth 51.2 GB/s vs 14.4 GB/s More than 3.5x higher memory bandwidth
Higher texture rate 40 GTexel/s vs 10 GTexel/s 4x higher texture rate
Higher pixel rate 10 GPixel/s vs 2.5 GPixel/s 4x higher pixel 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 820M

Reasons to consider the
Nvidia GeForce 820M

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Higher clock speed 625 MHz vs 500 MHz 25% higher clock speed
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed

Benchmarks Real world tests of GeForce GTS 250M vs 820M

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 820M
3,361.34

Features Key features of the GeForce GTS 250M  vs 820M 

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

GeForce GTS 250M
51.2 GB/s
GeForce 820M
14.4 GB/s

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

GeForce GTS 250M
10 GPixel/s
GeForce 820M
2.5 GPixel/s

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

GeForce GTS 250M
40 GTexel/s
GeForce 820M
10 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTS 250M
240 GFLOPS
GeForce 820M
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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