Radeon HD 6750 vs Radeon HD 6850

Intro

Compare all that to the Radeon HD 6850, which features GPU clock speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also features 960 Stream Processors, 48 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 6850		127 Watts
	Difference: 41 Watts (48%)

Memory Bandwidth

Performance-wise, the Radeon HD 6850 should in theory be much better than the Radeon HD 6750 overall. (explain)

Radeon HD 6850		128000 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 64000 (100%)

Texel Rate

The Radeon HD 6850 should be a lot (approximately 43%) faster with regards to texture filtering than the Radeon HD 6750. (explain)

Radeon HD 6850		37200 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 11100 (43%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6850 is a better choice, and very much so. (explain)

Radeon HD 6850		24800 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 13200 (114%)

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 (measured in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 processed in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at 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 its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.