GeForce GTX 285 2GB vs Radeon HD 7950

Intro

Compare all of that to the Radeon HD 7950, which features GPU clock speed of 800 MHz, and 1536 MB of GDDR5 RAM running at 1250 MHz through a 384-bit bus. It also features 1792 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950		200 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 4 Watts (2%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 is 51% faster than the GeForce GTX 285 2GB overall, due to its higher data rate. (explain)

Radeon HD 7950		240000 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 81024 (51%)

Texel Rate

The Radeon HD 7950 is much (about 73%) more effective at texture filtering than the GeForce GTX 285 2GB. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 37760 (73%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7950 is the winner, by far. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 4864 (23%)

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.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 processed per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video 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 most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.