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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 8400 GS PCI

Reasons to consider the
SPARKLE GeForce 8400 GS PCI

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Higher memory clock speed 500 MHz vs 400 MHz 25% higher memory clock speed

Features Key features of the GeForce GT 9400  vs 8400 GS PCI 

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 8400 GS PCI
2.08 GPixel/s

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

GeForce GT 9400
4.4 GTexel/s
GeForce 8400 GS PCI
4.16 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 9400
44.8 GFLOPS
GeForce 8400 GS PCI
39.36 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
8400 GS PCI 
GPU brand Nvidia Nvidia
GPU name G96 C1 G86
Market Desktop Desktop
Clock speed 550 MHz 520 MHz
Is dual GPU No No
Reference card None Nvidia GeForce 8400 GS PCI 520 MHz 512 MB

raw performance

Shading units 16 16
Texture mapping units 8 8
Render output processors 4 4
Pixel rate 2.2 GPixel/s 2.08 GPixel/s
Texture rate 4.4 GTexel/s 4.16 GTexel/s
Floating-point performance 44.8 GFLOPS 39.36 GFLOPS

memory

GeForce GT 9400  vs
8400 GS PCI 
Memory clock speed 400 MHz 500 MHz
Effective memory clock speed 800 MHz 1,000 MHz
Memory bus 128 bit 64 bit
Memory 512 MB 512 MB
Memory type GDDR3 DDR3
Memory bandwidth 12.8 GB/s 8 GB/s

noise and power

TDP 50W 40W

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