Radeon HD 3850 X2 vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which features a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2 should theoretically perform much faster than the Radeon HD 6770 overall. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 38784 (58%)

Texel Rate

The Radeon HD 6770 should be much (about 68%) better at anisotropic filtering than the Radeon HD 3850 X2. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 14624 (68%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3850 X2 is superior to the Radeon HD 6770, by far. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 6976 (48%)

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 maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core 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 per second.

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