Radeon HD 3850 X2 vs Radeon HD 6670 (OEM)

Intro

Compare that to the Radeon HD 6670 (OEM), which comes with GPU core speed of 800 MHz, and 512 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is made up of 480 Stream Processors, 24 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3850 X2 should theoretically be much better than the Radeon HD 6670 (OEM) overall. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon HD 6670 (OEM)		64000 MB/sec
	Difference: 41984 (66%)

Texel Rate

The Radeon HD 3850 X2 is a bit (more or less 11%) more effective at texture filtering than the Radeon HD 6670 (OEM). (explain)

Radeon HD 3850 X2		21376 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 2176 (11%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 3850 X2 is a better choice, by a large margin. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 14976 (234%)

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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number 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 graphics 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 number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.