A few days short of a full year, AMD rebranded the Radeon RX 500 series for OEMs. Bear in mind that back when it was launched, on April 18th, 2017, the Radeon RX 500 series was pretty much based on Radeon RX 400 series graphics cards with the same Polaris GPUs but on a more refined 14nm manufacturing process, calling it the Polaris Evolved.
It appears that we won't have to wait until June/July to see a five to six percent performance improvement as it was seen in a rather blurry crystal ball, as these are just simple rebrands for OEMs, something that both AMD and Nvidia have been convicted before..
It is not unusual that OEM and AIB-partner/retail graphics cards are not called the same or have different specifications but this time AMD made it simple and completely rebranded the entire non-OEM Radeon RX 500 series to Radeon RX 500X series, with a single exception of the Radeon RX 550X which has a somewhat higher Boost clock, as detailed by Techpowerup.com.
In case you missed it, the new Radeon RX 500X series include the Radeon RX 580X, RX 570X, RX 560X, RX 550X and the RX 540X graphics cards which should start showing up in OEM systems soon, urging for an upgrade to a shiny new Radeon RX 500X series graphics card.
You can check out the full list over at AMD's site.