Radeon HD 3850 256MB vs Radeon HD 6750

Intro

Compare that to the Radeon HD 6750, which comes with GPU clock speed of 725 MHz, and 512 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also features 720 Stream Processors, 36 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB		75 Watts
Radeon HD 6750		86 Watts
	Difference: 11 Watts (15%)

Memory Bandwidth

Performance-wise, the Radeon HD 6750 should in theory be quite a bit superior to the Radeon HD 3850 256MB in general. (explain)

Radeon HD 6750		64000 MB/sec
Radeon HD 3850 256MB		52992 MB/sec
	Difference: 11008 (21%)

Texel Rate

The Radeon HD 6750 will be a lot (about 144%) more effective at AF than the Radeon HD 3850 256MB. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 3850 256MB		10688 Mtexels/sec
	Difference: 15412 (144%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6750 is a better choice, though not by far. (explain)

Radeon HD 6750		11600 Mpixels/sec
Radeon HD 3850 256MB		10688 Mpixels/sec
	Difference: 912 (9%)

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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 are applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs 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 also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.