Radeon R9 380 2G vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon R9 380 2G		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

As far as performance goes, the Radeon R9 380 2G should in theory be a bit superior to the Radeon R9 M390X overall. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 22400 (14%)

Texel Rate

The Radeon R9 380 2G is just a bit (more or less 17%) more effective at AF than the Radeon R9 M390X. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 16096 (17%)

Pixel Rate

The Radeon R9 380 2G should be quite a bit (about 34%) better at full screen anti-aliasing than the Radeon R9 M390X, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 7904 (34%)

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 (in units of megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.