Bit of a correction folks, Netlist developed the HybriDIMMs using Samsung DRAM and NAND, united using their own proprietary interface. This, and my confusion, is in part to do some nasty and very costly IP litigation behind the scenes which lead to Samsung getting more credit for this than they deserved.
Netlist and Diablo Technologies worked together for a while and then parted ways. Soon after the split Diablo licensed SMART to produce ULLtraDIMMs and a court case was born. Not long afterwards SanDisk grabbed the IP from Diablo and now WD is buying SanDisk, making this an utter nightmare for a smaller company. Samsung invested $23m in Netdisk and offered a source of chips, albeit likely with strings, which has allowed Netdisk to develop HybriDIMMs.
Samsung Netlist has developed HybriDIMMs, replacing some of the DRAM on a memory module with NAND. This allows you to significantly increase the amount of memory available on a DIMM and reduces the price dramatically at the same time. The drawback is that NAND is significantly slower than DRAM; they intend to overcome that with the use of predictive algorithms they have called PreSight to pre-fetch data from the NAND and stage it in DRAM. This will compete with Intel's Optane XPoint DIMMs once they are released and will mean the DRAM market will split into two, the DRAM we are currently used to and these hybrid NAND DIMMs. Check out more details over at The Register.
"Gold plate can give a durable and affordable alloy a 24-carat veneer finish, adding value to cheap metal. DRAM gives Samsung-Netlist Hybrid DIMMs a cache veneer, providing what looks like DRAM to applications but is really persistent NAND underneath, cheaper than DRAM and lots of it."
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