GeForce GTX 980 vs Radeon R9 M390X

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX 980		165 Watts
	Difference: 40 Watts (32%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 980 will be 40% faster than the Radeon R9 M390X overall, due to its higher data rate. (explain)

GeForce GTX 980		224000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 64000 (40%)

Texel Rate

The GeForce GTX 980 is much (more or less 56%) more effective at AF than the Radeon R9 M390X. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 51584 (56%)

Pixel Rate

The GeForce GTX 980 should be much (about 211%) better at anti-aliasing than the Radeon R9 M390X, and also should be able to handle higher resolutions better. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 48928 (211%)

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 max amount of information (counted in MB per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's interface 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 4 instead. The higher the bandwidth is, the faster 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at 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 that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. 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, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.