Radeon HD 6750 1GB vs Radeon HD 7950

Intro

Compare those specs to the Radeon HD 7950, which has a GPU core clock speed of 800 MHz, and 1536 MB of GDDR5 memory running at 1250 MHz through a 384-bit bus. It also is made up of 1792 Stream Processors, 112 TAUs, and 32 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 7950		200 Watts
	Difference: 114 Watts (133%)

Memory Bandwidth

In theory, the Radeon HD 7950 will be 275% faster than the Radeon HD 6750 1GB overall, because of its greater bandwidth. (explain)

Radeon HD 7950		240000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 176000 (275%)

Texel Rate

The Radeon HD 7950 should be a lot (more or less 243%) better at texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 7950		89600 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 63500 (243%)

Pixel Rate

The Radeon HD 7950 should be much (about 121%) better at full screen anti-aliasing than the Radeon HD 6750 1GB, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7950		25600 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 14000 (121%)

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 MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.