South Korean tech insiders believe that SK Hynix has sent "12-layer DRAM stacked HBM3E (5th generation HBM)" prototype samples to NVIDIA—according a ZDNET.co.kr article, initial examples were shipped out last month. Reports from mid-2023 suggested that Team Green had sampled 8-layer HBM3E (4th gen) units around summer time—with SK Hynix receiving approval notices soon after. Another South Korean media outlet, DealSite, reckons that NVIDIA's memory qualification process has exposed HBM yield problems across a number of manufacturers. SK Hynix, Samsung and Micron are competing fiercely on the HBM3E front—with hopes of getting their respective products attached to NVIDIA's H200 AI GPU. DigiTimes Asia proposed that SK Hynix is ready to "commence mass production of fifth-generation HBM3E" at some point this month.

SK Hynix is believed to be leading the pack—insiders believe that yield rates are good enough to pass early NVIDIA certification, and advanced 12-layer samples are expected to be approved in the near future. ZDNET reckons that SK Hynix's forward momentum has placed it an advantageous position: "(They) supplied 8-layer HBM3E samples in the second half of last year and passed recent testing. Although the official schedule has not been revealed, mass production is expected to begin as early as this month. Furthermore, SK Hynix supplied 12-layer HBM3E samples to NVIDIA last month. This sample is an extremely early version and is mainly used to establish standards and characteristics of new products. SK Hynix calls it UTV (Universal Test Vehicle)... Since Hynix has already completed the performance verification of the 8-layer HBM3E, it is expected that the 12-layer HBM3E test will not take much time." SK Hynix's Vice President recently revealed that his company's 2024 HBM production volumes for were already sold out, and leadership is already preparing innovations for 2025 and beyond.