GeForce GTX 285 2GB vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which makes use of a 40 nm design. AMD has set the core frequency at 830 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this particular model. It features 1536 SPUs along with 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

Theoretically, the Radeon HD 6990 should 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 is quite a bit (about 207%) better 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 should be much (about 156%) faster with regards to FSAA than the GeForce GTX 285 2GB, and also will be capable of handling higher screen resolutions better. (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 data (measured in megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, 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 figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.