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At $15/GB of HBM4 the 331.8TB of HBM4 per pod is 5 million...

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

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.

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

It's HBM3e