RX 550 apparently runs at PCIe x4 according to GPU-Z, runs games just fine (relatively), need advice | TechPowerUp Forums
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Biostar Gaming Radeon RX 550 4GB GDDR5 128-Bit DirectX 12 PCI Express 3.0 DVI-D Dual Link, HDMI, DisplayPort - Newegg.com
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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
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