Radeon Pro Duo vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which comes with a core clock frequency of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon Pro Duo		350 Watts
	Difference: 225 Watts (180%)

Memory Bandwidth

In theory, the Radeon Pro Duo will be 540% quicker than the Radeon R9 M390X overall, because of its greater data rate. (explain)

Radeon Pro Duo		1024000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 864000 (540%)

Texel Rate

The Radeon Pro Duo should be quite a bit (about 453%) more effective at AF than the Radeon R9 M390X. (explain)

Radeon Pro Duo		512000 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 419456 (453%)

Pixel Rate

The Radeon Pro Duo is a lot (more or less 453%) faster with regards to full screen anti-aliasing than the Radeon R9 M390X, and will be capable of handling higher screen resolutions better. (explain)

Radeon Pro Duo		128000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 104864 (453%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.