GeForce GTX 1080 vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which features 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 Texture Address Units, 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 1080		180 Watts
	Difference: 55 Watts (44%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 1080 should theoretically be a lot superior to the Radeon R9 M390X overall. (explain)

GeForce GTX 1080		327680 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 167680 (105%)

Texel Rate

The GeForce GTX 1080 will be quite a bit (more or less 178%) faster with regards to texture filtering than the Radeon R9 M390X. (explain)

GeForce GTX 1080		257120 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 164576 (178%)

Pixel Rate

The GeForce GTX 1080 will be much (more or less 345%) better at AA than the Radeon R9 M390X, and also able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 1080		102848 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 79712 (345%)

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 (measured in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video 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 amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.