Radeon HD 7850 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which has a clock speed 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 features 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 7850 should in theory be a lot better than the Radeon R5 M255 in general. (explain)

Radeon HD 7850		153600 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 137600 (860%)

Texel Rate

The Radeon HD 7850 will be much (more or less 193%) faster with regards to AF than the Radeon R5 M255. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 36240 (193%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7850 is superior to the Radeon R5 M255, and very much so. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 20000 (266%)

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 max amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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, 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.