[zozbot234]

$15/GB is retail price for DIMM sticks. Is HBM4 really that cheap?

[selectodude]

HBM is just DRAM stacked directly next to the die. The expensive part is gluing it on there. The chips themselves are pretty much the same.

[akelly]

HBM uses about twice as much DRAM silicon per GB due to all the space for interconnect