Well, that is possible as a dude named sandrjanson_0 is offering the MSI Radeon RX 570 Gaming X 4G on ebay, it’s ab it pricy though at 379.99 USD 🙂
The 4GB model is listed with MPN RX570GAMINGX4GB and is the gaming X version with TwinFrozr VI cooler. The eBay listing has no specs detailed. Check the listing gere, my tiip .. just purchase a RX 480 and save yourself an easy 125 bucks.