Radeon HD 5750 512MB vs Radeon HD 7950 3GB

Intro

Compare all that to the Radeon HD 7950 3GB, which has GPU core speed of 800 MHz, and 3072 MB of GDDR5 memory running at 1250 MHz through a 384-bit bus. It also features 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 114 Watts (133%)

Memory Bandwidth

The Radeon HD 7950 3GB should in theory be much faster than the Radeon HD 5750 512MB in general. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 166400 (226%)

Texel Rate

The Radeon HD 7950 3GB should be a lot (more or less 256%) better at texture filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 64400 (256%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7950 3GB is the winner, by a large margin. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 14400 (129%)

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 max amount of information (measured in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should 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 high resolutions.

Texel Rate: Texel rate is the maximum 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 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 per second.

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