GeForce GTX 285 1GB vs Radeon HD 7990

Intro

Compare that to the Radeon HD 7990, which uses a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 RAM runs at a frequency of 1500 MHz on this specific model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 1GB		204 Watts
Radeon HD 7990		375 Watts
	Difference: 171 Watts (84%)

Memory Bandwidth

The Radeon HD 7990 should theoretically be quite a bit faster than the GeForce GTX 285 1GB overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 417024 (262%)

Texel Rate

The Radeon HD 7990 should be a lot (more or less 369%) more effective at texture filtering than the GeForce GTX 285 1GB. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 191360 (369%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7990 is a better choice, and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 40064 (193%)

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 data (measured in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.