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Differences What are the advantages of each

Front view of GeForce GTX 550 Ti

Reasons to consider the
Nvidia GeForce GTX 550 Ti

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Much higher effective memory clock speed 4,104 MHz vs 1,000 MHz More than 4x higher effective memory clock speed
Significantly higher clock speed 900 MHz vs 520 MHz Around 75% higher clock speed
Significantly higher memory bandwidth 98.5 GB/s vs 8 GB/s More than 12.2x higher memory bandwidth
More render output processors 24 vs 4 20 more render output processors
Better floating-point performance 691.2 GFLOPS vs 39.36 GFLOPS More than 17.5x better floating-point performance
Significantly higher memory clock speed 1,026 MHz vs 500 MHz More than 2x higher memory clock speed
Higher texture rate 28.8 GTexel/s vs 4.16 GTexel/s Around 7x higher texture rate
Wider memory bus 192 bit vs 64 bit 3x wider memory bus
More texture mapping units 32 vs 8 24 more texture mapping units
Front view of GeForce 8400 GS PCI

Reasons to consider the
SPARKLE GeForce 8400 GS PCI

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Lower TDP 40W vs 116W 2.9x lower TDP

Features Key features of the GeForce GTX 550 Ti  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 GTX 550 Ti
7.2 GPixel/s
GeForce 8400 GS PCI
2.08 GPixel/s

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

GeForce GTX 550 Ti
28.8 GTexel/s
GeForce 8400 GS PCI
4.16 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 550 Ti
691.2 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 GTX 550 Ti  vs
8400 GS PCI 
GPU brand Nvidia Nvidia
GPU name GF116 G86
Market Desktop Desktop
Clock speed 900 MHz 520 MHz
Is dual GPU No No
Reference card None Nvidia GeForce 8400 GS PCI 520 MHz 512 MB

raw performance

Shading units 192 16
Texture mapping units 32 8
Render output processors 24 4
Pixel rate 7.2 GPixel/s 2.08 GPixel/s
Texture rate 28.8 GTexel/s 4.16 GTexel/s
Floating-point performance 691.2 GFLOPS 39.36 GFLOPS

memory

GeForce GTX 550 Ti  vs
8400 GS PCI 
Memory clock speed 1,026 MHz 500 MHz
Effective memory clock speed 4,104 MHz 1,000 MHz
Memory bus 192 bit 64 bit
Memory 1,024 MB 512 MB
Memory type GDDR5 DDR3
Memory bandwidth 98.5 GB/s 8 GB/s

noise and power

TDP 116W 40W

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