Radeon HD 6950 vs Radeon R5 M255

Intro

Compare that to the Radeon R5 M255, which comes with GPU clock speed of 940 MHz, and 2048 MB of DDR3 memory running at 1000 MHz through a 64-bit bus. It also features 320 Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 6950 should in theory be a lot better than the Radeon R5 M255 overall. (explain)

Radeon HD 6950		160000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 144000 (900%)

Texel Rate

The Radeon HD 6950 will be a lot (more or less 274%) faster with regards to anisotropic filtering than the Radeon R5 M255. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 51600 (274%)

Pixel Rate

The Radeon HD 6950 is much (more or less 240%) more effective at anti-aliasing than the Radeon R5 M255, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 18080 (240%)

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 (measured in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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