what's funny is that even though there's about 300GB of RAM allocated to VMs, maybe 50GB of that is actually in use, so ESXi can just swap that shit out to local SSDs or slap VMs with the balloon driver to reclaim it from them - it all works fine

I'd say "let's see how proxmox does" but when the migration is complete i'll have exactly 1024GB of RAM available sooooo