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

Intro

Compare that to the Radeon HD 6670 (OEM), which has a 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 features 480 SPUs, 24 Texture Address Units, 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

Performance-wise, the Radeon HD 6670 (OEM) should theoretically be much better 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) should be much (approximately 80%) more effective at 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 quite a bit (about 67%) better at FSAA than the Radeon HD 6670 (OEM), and also will be able to handle higher screen resolutions more effectively. (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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.