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AMD's Ryzen 7000 CPUs will be faster than 5 GHz, require DDR5 RAM, support PCIe 5.0 | Ars Technica
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AMD Reveals the X570 Chipset: PCIe 4.0 is Here
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Everything You Need to Know About PCIe 4.0
PCIe 4.0: Everything you need to know, from specs to compatibility to caveats | PCWorld
Intel is prototyping PCIe 4.0 SSDs, but needs AMD CPUs to test them | TechSpot