Radeon HD 4850 1GB vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which comes with a GPU core clock speed of 940 MHz, and 2048 MB of DDR3 memory running at 1000 MHz through a 64-bit bus. It also is made up of 320 Stream Processors, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4850 1GB should in theory be much superior to the Radeon R5 M255 in general. (explain)

Radeon HD 4850 1GB		63552 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 47552 (297%)

Texel Rate

The Radeon HD 4850 1GB is quite a bit (approximately 33%) more effective at texture filtering than the Radeon R5 M255. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 6200 (33%)

Pixel Rate

The Radeon HD 4850 1GB should be much (more or less 33%) faster with regards to full screen anti-aliasing than the Radeon R5 M255, and also should be capable of handling higher resolutions better. (explain)

Radeon HD 4850 1GB		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 (counted in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 per second. This figure is worked out by multiplying the total number of texture units by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.