GeForce GTX 580 3GB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 119 Watts (95%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 580 3GB should theoretically be a bit superior to the Radeon R9 M390X overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 32384 (20%)

Texel Rate

The Radeon R9 M390X will be quite a bit (more or less 87%) better at anisotropic filtering than the GeForce GTX 580 3GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 580 3GB		49408 Mtexels/sec
	Difference: 43136 (87%)

Pixel Rate

The GeForce GTX 580 3GB is quite a bit (about 60%) better at full screen anti-aliasing than the Radeon R9 M390X, and also capable of handling higher screen resolutions better. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 13920 (60%)

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: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.