Radeon HD 4850 512MB vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which comes with core clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 320 SPUs along with 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 4850 512MB is 297% faster than the Radeon R5 M255 in general, due to its higher bandwidth. (explain)

Radeon HD 4850 512MB		63552 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 47552 (297%)

Texel Rate

The Radeon HD 4850 512MB will be much (approximately 33%) better at AF than the Radeon R5 M255. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 6200 (33%)

Pixel Rate

The Radeon HD 4850 512MB should be quite a bit (more or less 33%) faster with regards to full screen anti-aliasing than the Radeon R5 M255, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4850 512MB		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: Bandwidth is the max amount of data (in units of MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.