GeForce 8800 GT 512MB vs Radeon HD 6990

Intro

Compare those specs to the Radeon HD 6990, which features core clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 512MB		105 Watts
Radeon HD 6990		375 Watts
	Difference: 270 Watts (257%)

Memory Bandwidth

Theoretically, the Radeon HD 6990 should be much faster than the GeForce 8800 GT 512MB overall. (explain)

Radeon HD 6990		320000 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 262400 (456%)

Texel Rate

The Radeon HD 6990 should be much (about 374%) more effective at AF than the GeForce 8800 GT 512MB. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce 8800 GT 512MB		33600 Mtexels/sec
	Difference: 125760 (374%)

Pixel Rate

The Radeon HD 6990 will be quite a bit (more or less 453%) faster with regards to full screen anti-aliasing than the GeForce 8800 GT 512MB, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 43520 (453%)

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 largest amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number 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 per second.

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