Radeon R9 390 8G vs Radeon R9 M390X

Intro

Compare all of that 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 memory. It features 2048 SPUs as well as 128 Texture Address Units 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
Radeon R9 390 8G		275 Watts
	Difference: 150 Watts (120%)

Memory Bandwidth

In theory, the Radeon R9 390 8G should be quite a bit faster than the Radeon R9 M390X in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 224000 (140%)

Texel Rate

The Radeon R9 390 8G should be much (more or less 73%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 67456 (73%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 390 8G is superior to the Radeon R9 M390X, by far. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 40864 (177%)

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 data (measured in MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill 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 maximum fill rate.