Radeon R9 M390X vs Radeon RX 550

Intro

Compare all of that to the Radeon RX 550, which has a clock frequency of 1100 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 128-bit memory bus, and uses a 14 nm design. It features 512 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon R9 M390X		125 Watts
	Difference: 75 Watts (150%)

Memory Bandwidth

Performance-wise, the Radeon R9 M390X should theoretically be a lot better than the Radeon RX 550 in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 45312 (40%)

Texel Rate

The Radeon R9 M390X should be a lot (more or less 163%) more effective at texture filtering than the Radeon RX 550. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 57344 (163%)

Pixel Rate

The Radeon R9 M390X should be a lot (about 31%) more effective at AA than the Radeon RX 550, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon RX 550		17600 Mpixels/sec
	Difference: 5536 (31%)

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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.