GeForce GTX 580 vs Radeon R9 M270X

Intro

Compare those specifications to the Radeon R9 M270X, which features a core clock frequency of 725 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 should be 167% faster than the Radeon R9 M270X in general, due to its greater bandwidth. (explain)

GeForce GTX 580		192384 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 120384 (167%)

Texel Rate

The GeForce GTX 580 should be a lot (about 70%) better at texture filtering than the Radeon R9 M270X. (explain)

GeForce GTX 580		49408 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 20408 (70%)

Pixel Rate

The GeForce GTX 580 will be quite a bit (about 219%) more effective at anti-aliasing than the Radeon R9 M270X, and able to handle higher resolutions better. (explain)

GeForce GTX 580		37056 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 25456 (219%)

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 maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. 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, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.