Industry preps new ‘cheap’ HBM4 memory spec with narrow interface, but it isn’t a GDDR killer — JEDEC’s new SPHBM4 spec weds HBM4 performance and lower costs to enable higher capacity

JEDEC, the organization responsible for defining the specifications of industry-standard memory types, is close to finalizing SPHBM4, a new memory standard designed to deliver full HBM4-class bandwidth with a ‘narrow’ 512-bit interface, higher capacities, and lower integration costs by leveraging compatibility with conventional organic substrates. If the technology takes off, it will address many gaps in the markets HBM could serve, but as we’ll explain below, it isn’t likely to be a GDDR memory…