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MSI have released BETA BIOSes that support 256GB using 4x64GB Dimms on Intel 7xx and 6xx motherboards
MSI Brings 256 GB DDR5 Memory Support To Its Intel 700 & 600 Motherboards, Easy Compatibility
MSI is the latest motherboard manufacturer to introduce DDR5 memory support of up to 256 GB on its Intel 700 & 600 motherboards.
wccftech.com