Radeon HD 6750 vs Radeon HD 6850

Intro

Compare that to the Radeon HD 6850, which features GPU clock speed of 775 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also is made up of 960 Stream Processors, 48 Texture Address Units, and 32 ROPs.

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

Theoretically, the Radeon HD 6850 should be a lot faster than the Radeon HD 6750 in general. (explain)

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

Texel Rate

The Radeon HD 6850 is a lot (approximately 43%) better at AF than the Radeon HD 6750. (explain)

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

Pixel Rate

The Radeon HD 6850 will be quite a bit (more or less 114%) better at FSAA than the Radeon HD 6750, and should be able to handle higher resolutions without slowing down too much. (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 max amount of data (counted in MB per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video 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 most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.