GeForce GTX 285 1GB vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which features core clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs 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

As far as performance goes, the Radeon HD 7990 should in theory be quite a bit superior to the GeForce GTX 285 1GB in general. (explain)

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

Texel Rate

The Radeon HD 7990 is much (more or less 369%) better 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

The Radeon HD 7990 is a lot (more or less 193%) more effective at AA than the GeForce GTX 285 1GB, and should be capable of handling higher resolutions while still performing well. (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 (counted in MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, 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 worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.