Radeon HD 3470 512MB vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which has a clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6770 should theoretically perform quite a bit faster than the Radeon HD 3470 512MB overall. (explain)

Radeon HD 6770		67200 MB/sec
Radeon HD 3470 512MB		30400 MB/sec
	Difference: 36800 (121%)

Texel Rate

The Radeon HD 6770 should be much (approximately 1025%) more effective at texture filtering than the Radeon HD 3470 512MB. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 3470 512MB		3200 Mtexels/sec
	Difference: 32800 (1025%)

Pixel Rate

The Radeon HD 6770 is much (approximately 350%) better at anti-aliasing than the Radeon HD 3470 512MB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 3470 512MB		3200 Mpixels/sec
	Difference: 11200 (350%)

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 data (counted in MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus 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 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.