GeForce GT 220 GDDR3 vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which comes with a core clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It features 1536 SPUs, 96 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
Radeon HD 6990		375 Watts
	Difference: 317 Watts (547%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should in theory be a lot superior to the GeForce GT 220 GDDR3 overall. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 287616 (888%)

Texel Rate

The Radeon HD 6990 is a lot (more or less 1494%) better at texture filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 149360 (1494%)

Pixel Rate

The Radeon HD 6990 will be quite a bit (approximately 962%) more effective at AA than the GeForce GT 220 GDDR3, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 48120 (962%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units 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 figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.