GeForce GTX 580 3GB vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which has 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

As far as performance goes, the GeForce GTX 580 3GB should theoretically be much superior to the Radeon R5 M255 overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 176384 (1102%)

Texel Rate

The GeForce GTX 580 3GB is a lot (more or less 163%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

GeForce GTX 580 3GB		49408 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 30608 (163%)

Pixel Rate

The GeForce GTX 580 3GB will be much (about 393%) more effective at FSAA than the Radeon R5 M255, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 29536 (393%)

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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over 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 must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.