I see, it's good old NAND memory, just stacked. I thought they did some ground research and invented a new memory cell.
Starting at 400 GB/s is ok.
You can "stack" NAND storage too to increase speed: Get a PCIe Gen5 RAID card and it can be a temporary alternative for RAM in especially this task: reddit.com/r/LocalLLaMA/comments/1ow0jj0/running_a_1_trillion_parameter_model_on_a_pc_with/
SK Hynix has unveiled the first standard specifications for High Bandwidth Flash (HBF), a new memory tier designed to sit between HBM and SSDs in AI systems. The open standard supports up to 512 GB capacities, bandwidth of up to 3 TB/s and UCIe connectivity.
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