Radeon HD 6750 1GB vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which has a clock speed of 925 MHz and a GDDR5 memory frequency of 1375 MHz. It also makes use of a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 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 7970		250 Watts
	Difference: 164 Watts (191%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should perform quite a bit 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 is quite a bit (about 354%) better 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 using lots of anti-aliasing is important to you, then the Radeon HD 7970 is the winner, by a large margin. (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 maximum amount of information (counted in MB per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many 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.