Radeon HD 6750 vs Radeon HD 6870

Intro

Compare that to the Radeon HD 6870, which comes with a core clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is made up of 1120 SPUs, 56 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		86 Watts
Radeon HD 6870		151 Watts
	Difference: 65 Watts (76%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6870 should be a lot faster than the Radeon HD 6750 in general. (explain)

Radeon HD 6870		134400 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 70400 (110%)

Texel Rate

The Radeon HD 6870 will be quite a bit (more or less 93%) faster with regards to anisotropic filtering than the Radeon HD 6750. (explain)

Radeon HD 6870		50400 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 24300 (93%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6870 is a better choice, by far. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 17200 (148%)

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 largest amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.