Radeon HD 3850 X2 vs Radeon HD 6750 1GB

Intro

Compare those specifications to the Radeon HD 6750 1GB, which features a GPU core clock speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is comprised of 720 SPUs, 36 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 3850 X2 should be much faster than the Radeon HD 6750 1GB in general. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 41984 (66%)

Texel Rate

The Radeon HD 6750 1GB should be a lot (approximately 22%) faster with regards to anisotropic filtering than the Radeon HD 3850 X2. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 4724 (22%)

Pixel Rate

The Radeon HD 3850 X2 is much (approximately 84%) more effective at anti-aliasing than the Radeon HD 6750 1GB, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon HD 6750 1GB		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 max amount of data (measured in MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 Raster Operations Pipelines by the clock 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.