QUALCOMM SAYS HBC SILICON PASSES LAB VALIDATION: 18X LPDDR5X BANDWIDTH, 5X HBM4 BANDWIDTH PER WATT

Summary from the TLDR Hardware newsletter

Qualcomm's first High Bandwidth Compute silicon passed lab validation. HBC bonds stacked LPDDR memory to an AI accelerator base die, so compute sits under the memory and data travels less. Qualcomm claims 18x the effective bandwidth of LPDDR5X and over 5x the bandwidth per watt of HBM4, from early tests. HBC debuts in the Dragonfly AI250 inference accelerator, sampling in the first half of 2027.