AMD Radeon RX 500X Polaris Refresh Graphics Card Series Leaks Early
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There is no mention on AMD's website of a Radeon RX 530X or Radeon RX 520X. Either AMD is not planning to launch those cards (at least not initially), or it is using a different URL syntax, making them difficult to find at the moment.
As to the leak on 3DMark, the database entry points to a mobile Radeon RX 560X found inside an Acer laptop running alongside an AMD Ryzen 5 2500U processor with Radeon Vega 8 mobile graphics. According to the entry, the mobile variant sports 4GB of onboard memory clocked at 1,200MHz, with the GPU running at 1,275MHz. Assuming those are correct, the Radeon RX 560X is a tad faster than the Radeon RX 560M.
From what we can gather, the Polaris refresh will bring to the table slightly faster clockspeeds and power efficiency improvements, while retaining the same specifications as the cards being replaced. One of the leaked slides also mentions "expanded options and robust partner designs," perhaps hinting at better overclocking performance to boot. Overall it's not terribly exciting with Vega already on the scene.