Radeon HD 5970 vs Radeon HD 6750 1GB

Intro

Compare that to the Radeon HD 6750 1GB, which features a GPU core clock speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is made up of 720 Stream Processors, 36 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 5970		294 Watts
	Difference: 208 Watts (242%)

Memory Bandwidth

The Radeon HD 5970, in theory, should be quite a bit faster than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 5970		256000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 192000 (300%)

Texel Rate

The Radeon HD 5970 is quite a bit (approximately 789%) better at AF than the Radeon HD 6750 1GB. (explain)

Radeon HD 5970		232000 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 205900 (789%)

Pixel Rate

The Radeon HD 5970 will be a lot (approximately 700%) faster with regards to AA than the Radeon HD 6750 1GB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 5970		92800 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 81200 (700%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 can be processed per second. This is worked out by multiplying the total number of texture units 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.