Radeon HD 3850 X2 vs Radeon HD 6750 1GB

Intro

Compare those specifications to the Radeon HD 6750 1GB, which comes with a clock speed of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 720 SPUs, 36 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 X2 will be 66% quicker than the Radeon HD 6750 1GB overall, because of its greater bandwidth. (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 quite a bit (about 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

If using lots of anti-aliasing is important to you, then the Radeon HD 3850 X2 is a better choice, by far. (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 (counted in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.