JEDEC is currently presiding over standards for 6th generation high bandwidth memory (AKA HBM4)—the 12 and 16-layer DRAM designs are expected to reach mass production status in 2026. According to a ZDNET South Korea report, involved manufacturers are deliberating over HBM4 package thicknesses—allegedly, decision makers have settled on 775 micrometers (μm). This is thicker than the previous generation's measurement of 720 micrometers (μm). Samsung Electronics, SK Hynix and Micron are exploring "hybrid bonding," a new packaging technology—where onboard chips and wafers are linked directly to each other. Hybrid bonding is expected to be quite expensive to implement, so memory makers are carefully considering whether HBM4 warrants its usage.

ZDNET believes that JEDEC's agreement—settling on 775 micrometers (μm) for 12-layer and 16-layer stacked HBM4—could have: "a significant impact on the future packaging investment trends of major memory manufacturers. These companies have been preparing a new packaging technology, hybrid bonding, keeping in mind the possibility that the package thickness of HBM4 will be limited to 720 micrometers. However, if the package thickness is adjusted to 775 micrometers, 16-layer DRAM stacking HBM4 can be sufficiently implemented using existing bonding technology." A revised schedule could delay the rollout of hybrid bonding—perhaps pushed back to coincide with a launch of seventh generation HBM. The report posits that Samsung Electronics, SK Hynix and Micron memory engineers are about to focus on the upgrading of existing bonding technologies.