GeForce GT 220 GDDR3 vs GeForce GTX 660

Intro

Compare all that to the GeForce GTX 660, which has GPU core speed of 980 MHz, and 2048 MB of GDDR5 memory set to run at 1502 MHz through a 192-bit bus. It also is comprised of 960 SPUs, 80 TAUs, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
GeForce GTX 660		140 Watts
	Difference: 82 Watts (141%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 should in theory be quite a bit superior to the GeForce GT 220 GDDR3 in general. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 111808 (345%)

Texel Rate

The GeForce GTX 660 should be much (approximately 684%) better at texture filtering than the GeForce GT 220 GDDR3. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 68400 (684%)

Pixel Rate

The GeForce GTX 660 will be much (more or less 370%) better at full screen anti-aliasing than the GeForce GT 220 GDDR3, and capable of handling higher resolutions more effectively. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 18520 (370%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.