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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 clock speed 980 MHz vs 650 MHz More than 50% higher clock speed
Much higher effective memory clock speed 6,008 MHz vs 1,800 MHz More than 3.2x higher effective memory clock speed
Significantly better passmark score 4,118 vs 750 Around 5.5x better passmark score
More memory 2,048 MB vs 512 MB 4x more memory
Better floating-point performance 1,882 GFLOPS vs 208 GFLOPS More than 9x better floating-point performance
Higher memory bandwidth 144.2 GB/s vs 57.6 GB/s More than 2.5x higher memory bandwidth
Higher texture rate 78.4 GTexel/s vs 20.8 GTexel/s More than 3.8x higher texture rate
Much higher memory clock speed 1,502 MHz vs 900 MHz More than 65% higher memory clock speed
More shading units 960 vs 64 896 more shading units
Higher pixel rate 19.6 GPixel/s vs 10.4 GPixel/s Around 90% higher pixel rate
More texture mapping units 80 vs 32 48 more texture mapping units
More render output processors 24 vs 16 8 more render output processors
Front view of GeForce GT 9600

Reasons to consider the
ASUS GeForce GT 9600

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Wider memory bus 256 bit vs 192 bit Around 35% wider memory bus
Lower TDP 95W vs 140W More than 30% lower TDP

Benchmarks Real world tests of GeForce GTX 660 vs GeForce GT 9600

Passmark Industry standard benchmark for overall graphics card performance

3DMark 11, as the name might probably suggest, makes use of the Microsoft DirectX 11 API and puts every feature of it at its disposal to use, creating astonishingly realistic visuals.
GeForce GTX 660 | by techPowerUp! (Sep, 2012)

Features Key features of the GeForce GTX 660  vs GeForce GT 9600 

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

GeForce GTX 660
144.2 GB/s
GeForce GT 9600
57.6 GB/s
The 25% narrower memory-bus width shouldn't worry you because NVIDIA uses 6.00 GHz memory clock speed, resulting in a memory bandwidth of 144.
GeForce GTX 660 | by techPowerUp! (Sep, 2012)

pixel rate Number of pixels a graphics card can render to the screen every second

GeForce GTX 660
19.6 GPixel/s
GeForce GT 9600
10.4 GPixel/s
In terms of performance, we see an 8% performance improvement compared to the reference GTX 660.
GeForce GTX 660 | by techPowerUp! (Oct, 2012)

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

GeForce GTX 660
78.4 GTexel/s
GeForce GT 9600
20.8 GTexel/s
We benchmarked using the highest settings possible in DirectX 11 mode, which was added via a patch after release.
GeForce GTX 660 | by techPowerUp! (Sep, 2012)

floating point performance How fast the gpu can crunch numbers

GeForce GTX 660
1,882 GFLOPS
GeForce GT 9600
It makes use of Bethesda's Creation Engine, which isn't visually intensive in that it doesn't use taxing graphics features.
GeForce GTX 660 | by techPowerUp! (Sep, 2012)

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

NVIDIA took most of the G92 design and removed 64 shader pipes.
GeForce GT 9600 | by techPowerUp! (Feb, 2008)

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

The GK106 silicon packs a total of 960 CUDA cores, with 80 texture memory units (TMUs), 24 raster operations processors (ROPs), and a 192-bit wide GDDR5 memory interface.
GeForce GTX 660 | by techPowerUp! (Sep, 2012)

Reviews Word on the street

GeForce GTX 660  vs GeForce GT 9600 

The cooler is the average VGA cooling assembly using a Copper baseplate and an array of fins made from Aluminum.
GeForce GT 9600

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