Radeon HD 3850 256MB vs Radeon HD 6670 (OEM)

Intro

Compare all that to the Radeon HD 6670 (OEM), which comes with a core clock speed of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is made up of 480 SPUs, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM)		63 Watts
Radeon HD 3850 256MB		75 Watts
	Difference: 12 Watts (19%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) should be much faster than the Radeon HD 3850 256MB in general. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 3850 256MB		52992 MB/sec
	Difference: 11008 (21%)

Texel Rate

The Radeon HD 6670 (OEM) is quite a bit (about 80%) faster with regards to anisotropic filtering than the Radeon HD 3850 256MB. (explain)

Radeon HD 6670 (OEM)		19200 Mtexels/sec
Radeon HD 3850 256MB		10688 Mtexels/sec
	Difference: 8512 (80%)

Pixel Rate

The Radeon HD 3850 256MB should be much (approximately 67%) more effective at full screen anti-aliasing than the Radeon HD 6670 (OEM), and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 3850 256MB		10688 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 4288 (67%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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