Radeon HD 6750 1GB vs Radeon HD 6850

Intro

Compare that to the Radeon HD 6850, which features core speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 960 SPUs as well as 48 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 6850		127 Watts
	Difference: 41 Watts (48%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6850 should theoretically be much better than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 6850		128000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 64000 (100%)

Texel Rate

The Radeon HD 6850 will be quite a bit (approximately 43%) faster with regards to texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 6850		37200 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 11100 (43%)

Pixel Rate

The Radeon HD 6850 is a lot (approximately 114%) better at full screen anti-aliasing than the Radeon HD 6750 1GB, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6850		24800 Mpixels/sec
Radeon HD 6750 1GB		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 data (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 figure is worked out by multiplying the total amount of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.