Radeon HD 5670 vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which has a core clock frequency of 940 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 64-bit bus, and makes use of a 28 nm design. It is comprised of 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 5670 is 300% quicker than the Radeon R5 M255 in general, due to its greater data rate. (explain)

Radeon HD 5670		64000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 48000 (300%)

Texel Rate

The Radeon R5 M255 will be much (approximately 21%) better at texture filtering than the Radeon HD 5670. (explain)

Radeon R5 M255		18800 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 3300 (21%)

Pixel Rate

The Radeon R5 M255 is quite a bit (about 21%) faster with regards to AA than the Radeon HD 5670, and also should be capable of handling higher resolutions better. (explain)

Radeon R5 M255		7520 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 1320 (21%)

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 maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.