Radeon R9 380 2G vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which has GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

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

In theory, the Radeon R9 380 2G is 14% quicker than the Radeon R9 M390X overall, due to its higher data rate. (explain)

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

Texel Rate

The Radeon R9 380 2G will be a small bit (about 17%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 380 2G is a better choice, by a large margin. (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 MB per second) that can be transferred past 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 the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.