RX 550 apparently runs at PCIe x4 according to GPU-Z, runs games just fine (relatively), need advice | TechPowerUp Forums
AMD Radeon RX 550 review: A thrilling budget graphics card with a perplexing price | PCWorld
XFX USA
PH-RX550-4G-EVO|Graphics Cards|ASUS Global
AMD Radeon RX 550 not working - OSx86 10.14 (Mojave) | InsanelyMac
Radeon 500 series - Wikipedia
RX550 4GB 128Bit - ARKTEK
Gaming Dell OptiPlex 7040 Small Form Computer Desktop PC Intel Core i5 Processor, 8GB ddr4 Ram, 2TB Hard Drive, AMD Radeon RX 550 Phoenix 4GB GDDR5, New 22 inch LCD, WiFi, Windows
How to Tune GPU Performance Using Radeon Software | AMD