SK Hynix and SanDisk reveal first specs for High Bandwidth Flash — but don't get too excited, you probably won't be able to buy it anytime soon

SK Hynix 321-layer QLC NAND.

• The first HBF specification defines stacks of up to 512GB with three bandwidth grades from roughly 0.4TB/s to 3.0TB/s, connected to processors over UCIe and published openly through the Open Compute Project
• Google and Tenstorrent have joined the consortium, but Nvidia is not among the named participants, which matters more to HBF's prospects as a de facto alternative to increasingly pricey HBM
• Samples of the first AI inference devices built with HBF are expected to show up in early 2027

SK Hynix and SanDisk have published the first technical specification for High Bandwidth Flash.