GeForce GT 220 GDDR3 vs GeForce GTX 580

Intro

Compare all of that to the GeForce GTX 580, which features a clock speed of 772 MHz and a GDDR5 memory frequency of 1002 MHz. It also uses a 384-bit memory bus, and uses a 40 nm design. It is comprised of 512 SPUs, 64 Texture Address Units, and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
GeForce GTX 580		244 Watts
	Difference: 186 Watts (321%)

Memory Bandwidth

Performance-wise, the GeForce GTX 580 should theoretically be a lot better than the GeForce GT 220 GDDR3 in general. (explain)

GeForce GTX 580		192384 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 160000 (494%)

Texel Rate

The GeForce GTX 580 will be a lot (approximately 394%) faster with regards to anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 39408 (394%)

Pixel Rate

The GeForce GTX 580 should be quite a bit (about 641%) more effective at anti-aliasing than the GeForce GT 220 GDDR3, and should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 32056 (641%)

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 largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.