Make Windows 10 PC Use All RAM: Step-by-Step
If your PC isn't using all RAM, turn off Auto RAM Virtualization and check if your RAM is compatible with your motherboard.
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If the issue is with a faulty RAM slot on the motherboard, the solution would be to use a different slot, if available. If all slots are faulty or occupied, the motherboard may need to be replaced.
PCI Express - Wikipedia
How many PCI-E x16 slots does the motherboard have? – Learn about MSI - PRO Z890-P WIFI (Socket LGA 1851) Intel Z890 ATX DDR5 Wi-Fi 7 Motherboard - Black with 1 Answer – Best Buy.
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