GeForce GTX 580 vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which has GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also features 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

In theory, the GeForce GTX 580 will be 20% faster than the Radeon R9 M390X overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon R9 M390X should be quite a bit (about 87%) more effective at anisotropic 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 (approximately 60%) more effective at FSAA than the Radeon R9 M390X, and also will be able to handle higher resolutions more effectively. (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: Bandwidth is the max amount of information (in units of megabytes per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, 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 are 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 this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.