Radeon HD 6750 1GB vs Radeon HD 7970

Intro

Compare those specifications to the Radeon HD 7970, which has GPU core speed of 925 MHz, and 3072 MB of GDDR5 RAM running at 1375 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 Texture Address Units, 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 7970		250 Watts
	Difference: 164 Watts (191%)

Memory Bandwidth

Theoretically, the Radeon HD 7970 should perform much faster than the Radeon HD 6750 1GB in general. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 200000 (313%)

Texel Rate

The Radeon HD 7970 will be much (approximately 354%) faster with regards to texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 92300 (354%)

Pixel Rate

The Radeon HD 7970 is much (approximately 155%) more effective at full screen anti-aliasing than the Radeon HD 6750 1GB, and will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 18000 (155%)

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 transferred over the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.