ASRock B450 Steel Legend Quick Installation Guide - Page 27
Expansion Slots PCI Express Slots
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B450 Steel Legend 2.4 Expansion Slots (PCI Express Slots) There are 6 PCI Express slots on the motherboard. Before installing an expansion card, please make sure that the power supply is switched off or the power cord is unplugged. Please read the documentation of the expansion card and make necessary hardware settings for the card before you start the installation. PCIe slots: PCIE1 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards. PCIE2 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width cards. PCIE3 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width cards. PCIE4 (PCIe 3.0 x16 slot) is used for PCI Express x4 lane width graphics cards. PCIE5 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width cards. PCIE6 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width cards. * If M2_1 is occupied, PCIE4 will be disabled. PCIe Slot Configurations Ryzen Series CPUs (Pinnacle Ridge) Ryzen Series CPUs (Summit Ridge) Ryzen Series CPUs (Raven Ridge) Athlon series CPUs PCIE1 x16 x16 x8 x4 PCIE4 x4 x4 x4 x2 For a better thermal environment, please connect a chassis fan to the motherboard's chassis fan connector (CHA_FAN1/WP, CHA_FAN2/WP or CHA_FAN3/WP) when using multiple graphics cards. English 25