GeForce GTX 480 vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which makes use of a 28 nm design. AMD has clocked the core frequency at 940 MHz. The DDR3 memory works at a frequency of 1000 MHz on this particular card. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 480 should be 1009% quicker than the Radeon R5 M255 overall, due to its greater data rate. (explain)

GeForce GTX 480		177408 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 161408 (1009%)

Texel Rate

The GeForce GTX 480 will be much (about 123%) better at AF than the Radeon R5 M255. (explain)

GeForce GTX 480		42000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 23200 (123%)

Pixel Rate

The GeForce GTX 480 should be quite a bit (more or less 347%) faster with regards to AA than the Radeon R5 M255, and able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 26080 (347%)

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 megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core 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 output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.