Radeon HD 3690/3830 vs Radeon HD 5570

Intro

Compare those specs to the Radeon HD 5570, which features a core clock frequency of 650 MHz and a DDR3 memory frequency of 900 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 400(80x5) SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 3690/3830		75 Watts
	Difference: 32 Watts (74%)

Memory Bandwidth

In theory, the Radeon HD 5570 should perform a little bit faster than the Radeon HD 3690/3830 overall. (explain)

Radeon HD 5570		28800 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 2304 (9%)

Texel Rate

The Radeon HD 5570 will be much (more or less 22%) more effective at AF than the Radeon HD 3690/3830. (explain)

Radeon HD 5570		13000 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 2312 (22%)

Pixel Rate

The Radeon HD 3690/3830 will be quite a bit (more or less 106%) better at FSAA than the Radeon HD 5570, and also should be capable of handling higher resolutions better. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 5488 (106%)

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 data (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the 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 maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.