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AMD confirms lack of PCIe 4.0 support on older motherboards
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B550 motherboard guide: ASUS and AMD bring PCI Express 4.0 to everyone with ROG Strix, TUF Gaming, and Prime - Edge Up
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PCIe 4.0 for all: Asus announces its B550 motherboard line-up - NotebookCheck.net News
Asus publishes X470 and B450 PCIe Gen 4 compatibility chart - Mainboard - News - HEXUS.net
