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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 lower TDP 50W vs 65W Around 25% lower TDP
Front view of GeForce GT 630

Reasons to consider the
EVGA GeForce GT 630

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Significantly higher effective memory clock speed 3,200 MHz vs 800 MHz 4x higher effective memory clock speed
Higher clock speed 810 MHz vs 550 MHz More than 45% higher clock speed
Higher memory bandwidth 51.2 GB/s vs 12.8 GB/s More than 4x higher memory bandwidth
Significantly higher memory clock speed 800 MHz vs 400 MHz 2x higher memory clock speed
Higher metro: last light framerate 29 vs 16 More than 80% higher metro: last light framerate

Benchmarks Real world tests of GeForce GT 9400 vs 630

Metro: Last Light

Features Key features of the GeForce GT 9400  vs 630 

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

GeForce GT 9400
12.8 GB/s
GeForce GT 630
51.2 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 630
3.24 GPixel/s

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

GeForce GT 9400
4.4 GTexel/s
GeForce GT 630
12.96 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 9400
44.8 GFLOPS
GeForce GT 630
311.04 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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