Radeon HD 3850 1GB vs Radeon HD 6750 1GB

Intro

Compare those specifications to the Radeon HD 6750 1GB, which comes with a core clock frequency of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 720 SPUs, 36 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon HD 6750 1GB should theoretically be much superior to the Radeon HD 3850 1GB in general. (explain)

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

Texel Rate

The Radeon HD 6750 1GB should be quite a bit (more or less 144%) more effective at texture filtering than the Radeon HD 3850 1GB. (explain)

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

Pixel Rate

The Radeon HD 6750 1GB is just a bit (about 9%) faster with regards to anti-aliasing than the Radeon HD 3850 1GB, and will be capable of handling higher resolutions better. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 3850 1GB		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 largest amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video 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 can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.