GeForce GTX 980M vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which features clock 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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 980M		100 Watts
Radeon R9 M390X		125 Watts
	Difference: 25 Watts (25%)

Memory Bandwidth

Theoretically, the Radeon R9 M390X should perform much faster than the GeForce GTX 980M in general. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 980M		128000 MB/sec
	Difference: 32000 (25%)

Texel Rate

The GeForce GTX 980M will be a little bit (about 8%) better at anisotropic filtering than the Radeon R9 M390X. (explain)

GeForce GTX 980M		99648 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 7104 (8%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 980M is the winner, by far. (explain)

GeForce GTX 980M		66432 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 43296 (187%)

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 data (measured in MB per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

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