GeForce GTX 285 1GB vs Radeon HD 7950

Intro

Compare all of that to the Radeon HD 7950, which features GPU core speed of 800 MHz, and 1536 MB of GDDR5 memory set to run at 1250 MHz through a 384-bit bus. It also features 1792 Stream Processors, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950		200 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 4 Watts (2%)

Memory Bandwidth

In theory, the Radeon HD 7950 should be quite a bit faster than the GeForce GTX 285 1GB overall. (explain)

Radeon HD 7950		240000 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 81024 (51%)

Texel Rate

The Radeon HD 7950 should be quite a bit (about 73%) faster with regards to AF than the GeForce GTX 285 1GB. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 37760 (73%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7950 is the winner, and very much so. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce GTX 285 1GB		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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 are processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.