GeForce GTX 580 3GB vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which has core clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs as well as 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce GTX 580 3GB should in theory be a lot better than the Radeon R9 M385X overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 96384 (100%)

Texel Rate

The Radeon R9 M385X will be much (about 25%) more effective at texture filtering than the GeForce GTX 580 3GB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 12192 (25%)

Pixel Rate

The GeForce GTX 580 3GB will be a lot (about 111%) better at AA than the Radeon R9 M385X, and also capable of handling higher resolutions better. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 19456 (111%)

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 (in units of megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 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 AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.