Radeon HD 3690/3830 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which has core speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 320 SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3690/3830 should be a lot faster than the Radeon R5 M255 in general. (explain)

Radeon HD 3690/3830		26496 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 10496 (66%)

Texel Rate

The Radeon R5 M255 will be a lot (about 76%) better at texture filtering than the Radeon HD 3690/3830. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 8112 (76%)

Pixel Rate

The Radeon HD 3690/3830 is much (approximately 42%) better at AA than the Radeon R5 M255, and also should be able to handle higher screen resolutions better. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 3168 (42%)

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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 applied in one 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.