GeForce GTX 580 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which has core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator 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

In theory, the GeForce GTX 580 should be a bit faster than the Radeon R9 M390X in general. (explain)

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

Texel Rate

The Radeon R9 M390X will be a lot (more or less 87%) more effective 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 (more or less 60%) more effective at anti-aliasing than the Radeon R9 M390X, and also will be capable of handling higher screen 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 maximum amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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