Radeon HD 6750 1GB vs Radeon HD 6870

Intro

Compare all of that to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM works at a frequency of 1050 MHz on this specific model. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 6870		151 Watts
	Difference: 65 Watts (76%)

Memory Bandwidth

Theoretically, the Radeon HD 6870 should be quite a bit faster than the Radeon HD 6750 1GB in general. (explain)

Radeon HD 6870		134400 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 70400 (110%)

Texel Rate

The Radeon HD 6870 will be much (more or less 93%) better at anisotropic filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 6870		50400 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 24300 (93%)

Pixel Rate

The Radeon HD 6870 will be quite a bit (approximately 148%) better at AA than the Radeon HD 6750 1GB, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon HD 6750 1GB		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 information (measured in MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied 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 this number, the better the graphics 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 most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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 get to the maximum fill rate.