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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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Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of GeForce GT 630 PCIe x8

Reasons to consider the
Nvidia GeForce GT 630 PCIe x8

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Significantly higher clock speed 902 MHz vs 550 MHz Around 65% higher clock speed
Higher effective memory clock speed 1,800 MHz vs 800 MHz 2.2x higher effective memory clock speed
More memory 2,048 MB vs 512 MB 4x more memory
Better floating-point performance 692.7 GFLOPS vs 44.8 GFLOPS Around 15.5x better floating-point performance
Significantly higher memory clock speed 900 MHz vs 400 MHz 2.2x higher memory clock speed
More shading units 384 vs 16 368 more shading units
Lower TDP 25W vs 50W 2x lower TDP

Features Key features of the GeForce GT 9400  vs 630 PCIe x8 

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

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 PCIe x8
7.22 GPixel/s

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

GeForce GT 9400
4.4 GTexel/s
GeForce GT 630 PCIe x8
14.43 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 9400
44.8 GFLOPS
GeForce GT 630 PCIe x8
692.7 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

Specifications Full list of technical specs

gpu

GeForce GT 9400  vs
630 PCIe x8 
GPU brand Nvidia Nvidia
GPU name G96 C1 GK208
Market Desktop Desktop
Clock speed 550 MHz 902 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 16 384
Texture mapping units 8 16
Render output processors 4 8
Pixel rate 2.2 GPixel/s 7.22 GPixel/s
Texture rate 4.4 GTexel/s 14.43 GTexel/s
Floating-point performance 44.8 GFLOPS 692.7 GFLOPS

memory

GeForce GT 9400  vs
630 PCIe x8 
Memory clock speed 400 MHz 900 MHz
Effective memory clock speed 800 MHz 1,800 MHz
Memory bus 128 bit 64 bit
Memory 512 MB 2,048 MB
Memory type GDDR3 DDR3
Memory bandwidth 12.8 GB/s 14.4 GB/s

noise and power

TDP 50W 25W

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