If they have DRAM then they would be using DDR4.
They wouldnt use DDR3 it would literally be more expensive to source DDR3 modules to place in an SSD today than to simply source the common DDR4 modules.
And we already have alot of SSD in this spec.
Its another one I can add to the list:
- PNY XLR8 CS3140 — 7,500MB/s reads, 6,850MB/s writes
- Adata XPG Gammix S70 — 7,400MB/s reads, 6,400MB/s writes
- Mushkin Gamma — 7,175MB/s reads, 6,800MB/s writes
- Sabrent Rocket 4 Plus — 7,100MB/s reads, 6000MB/s writes
- Samsung 980 Pro — 7,000MB/s reads, 5,000MB/s writes
- WD SN850 Black — 7,000MB/s reads, 5,300MB/s writes
- Patriot Viper VP4 — 7,400MB/s reads, 6800MB/s writes