Radeon HD 4850 2GB vs Radeon R5 M255

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4850 2GB should be quite a bit faster than the Radeon R5 M255 in general. (explain)

Radeon HD 4850 2GB		63552 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 47552 (297%)

Texel Rate

The Radeon HD 4850 2GB should be a lot (more or less 33%) better at AF than the Radeon R5 M255. (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 6200 (33%)

Pixel Rate

The Radeon HD 4850 2GB is quite a bit (approximately 33%) better at AA than the Radeon R5 M255, and will be capable of handling higher screen resolutions better. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 2480 (33%)

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 over the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends 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.