Which is a bargain compared to what DRAM costs today. If you just include the bare minimum of DRAM for a successful boot and immediately set up the entire "small" Optane drive as swap, that's a viable workstation-class system for comparative peanuts. You can't do this with NAND because the write workload of swap kills the media (I suppose it becomes viable if you monitor SMART wearout indicators and heavily overprovision the storage to leverage the drive's pSLC mode, but you're still treating $~0.10/GB hardware as a consumable and that will cost you) and of course you can't do it with spinning rust because the media is too slow.