GeForce GT 220 GDDR3 vs Geforce GTX 680

Intro

Compare that to the Geforce GTX 680, which uses a 28 nm design. nVidia has set the core frequency at 1006 MHz. The GDDR5 memory is set to run at a frequency of 1502 MHz on this specific model. It features 1536 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
Geforce GTX 680		195 Watts
	Difference: 137 Watts (236%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 should be a lot faster than the GeForce GT 220 GDDR3 in general. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 159872 (494%)

Texel Rate

The Geforce GTX 680 is a lot (approximately 1188%) better at anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 118768 (1188%)

Pixel Rate

The Geforce GTX 680 will be much (approximately 544%) better at AA than the GeForce GT 220 GDDR3, and also should be able to handle higher screen resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 27192 (544%)

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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.