They have 2TB RAM in there, and I suspect that is not the largest possible amount if you're willing to spend more money (though probably the largest possible amount for that particular server).
I played around a bit on the Dell website, and the largest server I could find supported up to 6TB RAM, with a price at ~300k EUR (I assume nobody pays list price for these).
4TB seems to be the limit for normal-ish servers. 32 slots filled with 128GB DIMMS. You can find servers with more slots (48 is common, 6TB), but you're going past most people's definition of "commodity".
https://letsencrypt.org/2021/01/21/next-gen-database-servers...
They have 2TB RAM in there, and I suspect that is not the largest possible amount if you're willing to spend more money (though probably the largest possible amount for that particular server).
I played around a bit on the Dell website, and the largest server I could find supported up to 6TB RAM, with a price at ~300k EUR (I assume nobody pays list price for these).