Radeon HD 3850 X2 vs Radeon HD 6750

Intro

Compare those specifications to the Radeon HD 6750, which comes with GPU core speed of 725 MHz, and 512 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is comprised of 720 Stream Processors, 36 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2, in theory, should be much faster than the Radeon HD 6750 in general. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 41984 (66%)

Texel Rate

The Radeon HD 6750 should be much (more or less 22%) faster with regards to anisotropic filtering than the Radeon HD 3850 X2. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 4724 (22%)

Pixel Rate

The Radeon HD 3850 X2 should be quite a bit (about 84%) faster with regards to anti-aliasing than the Radeon HD 6750, and also will be capable of handling higher resolutions better. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 9776 (84%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once 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 processed in one second. This is calculated by multiplying the total number of texture units of the card by the core 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.