They are often based on lower density DDR3 chips that consume more power per bit. That being said you can do 1TB on a normal dual socket server with 64GB DDR4 L

They are often based on lower density DDR3 chips that consume more power per bit. That being said you can do 1TB on a normal dual socket server with 64GB DDR4 LR-DIMMs for a while now, though they do come at a cost per bit premium.