GeForce GTX 580 vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which features core speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The GeForce GTX 580 should in theory be a bit faster than the Radeon R9 M295X in general. (explain)

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

Texel Rate

The Radeon R9 M295X will be much (about 94%) better at texture filtering than the GeForce GTX 580. (explain)

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

Pixel Rate

The GeForce GTX 580 should be quite a bit (approximately 54%) faster with regards to anti-aliasing than the Radeon R9 M295X, and will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 580		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 information (in units of MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.