Radeon R9 380X vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which comes with a core clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 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 380X		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380X should be 14% quicker than the Radeon R9 M390X in general, due to its greater data rate. (explain)

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

Texel Rate

The Radeon R9 380X should be a lot (approximately 34%) faster with regards to texture filtering than the Radeon R9 M390X. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 31616 (34%)

Pixel Rate

The Radeon R9 380X will be quite a bit (approximately 34%) more effective at FSAA than the Radeon R9 M390X, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 380X		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 maximum amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.