Anyone have any recommendations for motherboards / Zen 3 CPU combos that support both PCIE 4.0 (Gen4) and 128 GB of RAM?
Do the newest Ryzen chips support 128 GB or do you need to go to Threadrippers / Epycs for that?
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This site says that the Ryzen 9 5900x supports up to 128GB -- I'll have to verify.
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The chips do, it's usually the boards that don't have enough RAM channels for that. You have to find a board that supports 4x32 GB modules. (And make sure the modules you want are actually on the supported memory list for that board!)
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My B450 aorus pro and 2700 cpu runs great on 128GB. I had to update to a recent BIOS to get it to recognise all the ram. be sure check the motherboard manufacturers page.
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Ryzen chips definitely support it, but regardless of x570 mobo I think you'd need to dial it in via bios. I use an ITX 32x2 set-up and it works great. Might be worth trying with one 32x2 + random 8GB stick to see if it goes above 64.
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Here's one if you REALLY want white ram!