Radeon HD 3850 512MB vs Radeon HD 6750 1GB

Intro

Compare all of that to the Radeon HD 6750 1GB, which uses a 40 nm design. AMD has set the core speed at 725 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this specific model. It features 720 SPUs along with 36 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB		75 Watts
Radeon HD 6750 1GB		86 Watts
	Difference: 11 Watts (15%)

Memory Bandwidth

Performance-wise, the Radeon HD 6750 1GB should in theory be a lot better than the Radeon HD 3850 512MB overall. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 3850 512MB		52992 MB/sec
	Difference: 11008 (21%)

Texel Rate

The Radeon HD 6750 1GB is a lot (approximately 144%) more effective at texture filtering than the Radeon HD 3850 512MB. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 3850 512MB		10688 Mtexels/sec
	Difference: 15412 (144%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6750 1GB is superior to the Radeon HD 3850 512MB, though not by far. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 3850 512MB		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 maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It's worked out 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 it uses DDR5, multiply by 4 instead. The higher the 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 amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher 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 most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.