GeForce GTX 285 2GB vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which comes with GPU core speed of 830 MHz, and 2048 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 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 GTX 285 2GB		204 Watts
Radeon HD 6990		375 Watts
	Difference: 171 Watts (84%)

Memory Bandwidth

The Radeon HD 6990 should in theory perform a lot faster than the GeForce GTX 285 2GB overall. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 161024 (101%)

Texel Rate

The Radeon HD 6990 should be quite a bit (more or less 207%) more effective at texture filtering than the GeForce GTX 285 2GB. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 107520 (207%)

Pixel Rate

The Radeon HD 6990 will be quite a bit (more or less 156%) more effective at FSAA than the GeForce GTX 285 2GB, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 32384 (156%)

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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.