Radeon HD 6970 vs Radeon R5 M255

Intro

Compare all of that 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 RAM. It features 320 SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 6970 will be 1000% quicker than the Radeon R5 M255 overall, due to its higher data rate. (explain)

Radeon HD 6970		176000 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 160000 (1000%)

Texel Rate

The Radeon HD 6970 should be a lot (approximately 349%) faster with regards to AF than the Radeon R5 M255. (explain)

Radeon HD 6970		84480 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 65680 (349%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6970 is the winner, by far. (explain)

Radeon HD 6970		28160 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 20640 (274%)

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 largest amount of data (in units of MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.