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Differences What are the advantages of each

Front view of GeForce GT 9400

Reasons to consider the
Nvidia GeForce GT 9400

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Slightly higher clock speed 550 MHz vs 500 MHz 10% higher clock speed
Front view of GeForce GT 320M

Reasons to consider the
Nvidia GeForce GT 320M

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Higher effective memory clock speed 1,580 MHz vs 800 MHz Around 2x higher effective memory clock speed
Higher memory clock speed 790 MHz vs 400 MHz Around 2x higher memory clock speed
Lower TDP 23W vs 50W 2.2x lower TDP

Benchmarks Real world tests of GeForce GT 9400 vs 320M

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GT 9400  vs 320M 

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

GeForce GT 9400
12.8 GB/s
GeForce GT 320M
25.28 GB/s

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

GeForce GT 9400
2.2 GPixel/s
GeForce GT 320M
4 GPixel/s

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

GeForce GT 9400
4.4 GTexel/s
GeForce GT 320M
4 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 9400
44.8 GFLOPS
GeForce GT 320M
52.8 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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