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Re:Optane Memory – A bridge between DRAM and storage by fulafel on Tuesday March 28, 2017 @01:00AM (#13974210)
The first SSDs were DRAM based and pretty fast for the time, see eg. https://en.wikipedia.org/wiki/Cray_Y-MP. (SRAM, now used in CPU caches, was used for the whole main memory on that machine)

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