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Differences What are the advantages of each

Front view of GeForce GTX 660

Reasons to consider the
Nvidia GeForce GTX 660

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Much higher effective memory clock speed 5,600 MHz vs 1,000 MHz More than 5.5x higher effective memory clock speed
Much higher memory bandwidth 179.2 GB/s vs 8 GB/s Around 22.5x higher memory bandwidth
Higher clock speed 823 MHz vs 520 MHz Around 60% higher clock speed
Better floating-point performance 1,896.2 GFLOPS vs 39.36 GFLOPS Around 48.2x better floating-point performance
Significantly higher texture rate 79 GTexel/s vs 4.16 GTexel/s Around 19x higher texture rate
More memory 2,048 MB vs 512 MB 4x more memory
Significantly more texture mapping units 96 vs 8 88 more texture mapping units
Significantly more render output processors 32 vs 4 28 more render output processors
Much higher memory clock speed 1,400 MHz vs 500 MHz More than 2.8x higher memory clock speed
Significantly more shading units 1,152 vs 16 1136 more shading units
Higher pixel rate 19.75 GPixel/s vs 2.08 GPixel/s Around 9.5x higher pixel rate
Significantly wider memory bus 256 bit vs 64 bit 4x wider memory bus
Front view of GeForce 8400 GS PCI

Reasons to consider the
SPARKLE GeForce 8400 GS PCI

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Significantly lower TDP 40W vs 130W 3.2x lower TDP

Features Key features of the GeForce GTX 660  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 660
19.75 GPixel/s
GeForce 8400 GS PCI
2.08 GPixel/s

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

GeForce GTX 660
79 GTexel/s
GeForce 8400 GS PCI
4.16 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTX 660
1,896.2 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 660  vs
8400 GS PCI 
GPU brand Nvidia Nvidia
GPU name GK104 G86
Market Desktop Desktop
Clock speed 823 MHz 520 MHz
Is dual GPU No No
Reference card Nvidia GeForce GTX 660 980 MHz 2 GB Nvidia GeForce 8400 GS PCI 520 MHz 512 MB

raw performance

Shading units 1,152 16
Texture mapping units 96 8
Render output processors 32 4
Pixel rate 19.75 GPixel/s 2.08 GPixel/s
Texture rate 79 GTexel/s 4.16 GTexel/s
Floating-point performance 1,896.2 GFLOPS 39.36 GFLOPS

memory

GeForce GTX 660  vs
8400 GS PCI 
Memory clock speed 1,400 MHz 500 MHz
Effective memory clock speed 5,600 MHz 1,000 MHz
Memory bus 256 bit 64 bit
Memory 2,048 MB 512 MB
Memory type GDDR5 DDR3
Memory bandwidth 179.2 GB/s 8 GB/s

noise and power

TDP 130W 40W

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