GeForce GTX 580 3GB vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which has a core clock speed of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 119 Watts (95%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 3GB is 9% quicker than the Radeon R9 M295X in general, because of its higher bandwidth. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 16384 (9%)

Texel Rate

The Radeon R9 M295X should be a lot (more or less 94%) better at anisotropic filtering than the GeForce GTX 580 3GB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 46592 (94%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 580 3GB is the winner, by far. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 13056 (54%)

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 (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at 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 can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.