Radeon HD 5750 512MB vs Radeon HD 6950 2GB

Intro

Compare those specifications to the Radeon HD 6950 2GB, which features a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1408 SPUs, 88 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 114 Watts (133%)

Memory Bandwidth

Theoretically, the Radeon HD 6950 2GB should be a lot faster than the Radeon HD 5750 512MB overall. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 86400 (117%)

Texel Rate

The Radeon HD 6950 2GB should be much (approximately 179%) faster with regards to AF than the Radeon HD 5750 512MB. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 45200 (179%)

Pixel Rate

The Radeon HD 6950 2GB is a lot (more or less 129%) faster with regards to FSAA than the Radeon HD 5750 512MB, and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6950 2GB		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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better 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 most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.