GeForce GTX 580 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which comes with a clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The GeForce GTX 580 should in theory be a small bit faster than the Radeon R9 M390X overall. (explain)

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

Texel Rate

The Radeon R9 M390X will be much (about 87%) better at texture filtering than the GeForce GTX 580. (explain)

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

Pixel Rate

The GeForce GTX 580 is quite a bit (about 60%) more effective at anti-aliasing than the Radeon R9 M390X, and should be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 580		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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If 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 texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.