Radeon R9 M390X vs Radeon RX 470 4GB

Intro

Compare those specs to the Radeon RX 470 4GB, which has GPU clock speed of 926 MHz, and 4096 MB of GDDR5 memory set to run at 1650 MHz through a 256-bit bus. It also 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 RX 470 4GB		120 Watts
Radeon R9 M390X		125 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

In theory, the Radeon RX 470 4GB will be 32% quicker than the Radeon R9 M390X in general, due to its greater bandwidth. (explain)

Radeon RX 470 4GB		211200 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 51200 (32%)

Texel Rate

The Radeon RX 470 4GB is quite a bit (approximately 28%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 25984 (28%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 470 4GB is a better choice, by a large margin. (explain)

Radeon RX 470 4GB		29632 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 6496 (28%)

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 information (in units of MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the 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 that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.