Radeon R9 M390X vs Radeon RX 470

Intro

Compare those specifications to the Radeon RX 470, which has core clock speeds of 926 MHz on the GPU, and 1650 MHz on the 8192 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470		120 Watts
Radeon R9 M390X		125 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

As far as performance goes, the Radeon RX 470 should in theory be quite a bit superior to the Radeon R9 M390X overall. (explain)

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

Texel Rate

The Radeon RX 470 will be a lot (about 28%) more effective at texture filtering than the Radeon R9 M390X. (explain)

Radeon RX 470		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 is a better choice, by a large margin. (explain)

Radeon RX 470		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 (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.