Radeon HD 6750 1GB vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which makes use of a 28 nm design. AMD has clocked the core speed at 925 MHz. The GDDR5 memory runs at a speed of 1375 MHz on this model. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator 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

As far as performance goes, the Radeon HD 7970 should in theory be quite a bit better than the Radeon HD 6750 1GB overall. (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 quite a bit (about 354%) more effective at AF 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 7970 is the winner, and very much so. (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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.