Radeon HD 5750 1GB vs Radeon HD 6950 2GB

Intro

Compare those specs to the Radeon HD 6950 2GB, which comes with core speeds of 800 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1408 SPUs as well as 88 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 114 Watts (133%)

Memory Bandwidth

In theory, the Radeon HD 6950 2GB should be 117% quicker than the Radeon HD 5750 1GB overall, due to its higher bandwidth. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 86400 (117%)

Texel Rate

The Radeon HD 6950 2GB will be much (about 179%) more effective at AF than the Radeon HD 5750 1GB. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 45200 (179%)

Pixel Rate

The Radeon HD 6950 2GB will be quite a bit (about 129%) better at anti-aliasing than the Radeon HD 5750 1GB, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6950 2GB		25600 Mpixels/sec
Radeon HD 5750 1GB		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 data (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels 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 Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.