I'm fairly sure I know where I can buy used/refurb Dell R820 at good prices with 512 or 1024GB of RAM, but I don't think I could accomplish the same for 4TB of RAM and $4000. Certainly not in one machine. And not with two $2000 machines each with 2048MB. We're close, but it's not that cheap yet.
Looking on ebay I can find some pretty decent R820 with 512GB each for right around $1500 a piece. Not counting any storage, even if they come used with some spinning hard drives, would end up replacing with SSDs. So more like three servers, 1.5TB of RAM, for $4500.
Looking on ebay I can find some pretty decent R820 with 512GB each for right around $1500 a piece. Not counting any storage, even if they come used with some spinning hard drives, would end up replacing with SSDs. So more like three servers, 1.5TB of RAM, for $4500.