Phison reveals the PS5018-E18 NVMe SSD controller, this model promises even higher performance than the E16 model that's currently used by various PCI Express 4.0 SSDs. KitGuru reports the controller offers bandwidth of up to 7000MB/s as well as support for up to 8TB of NAND flash memory.
As you might expect, these speeds will only be possible via PCIe 4.0, so you will need a motherboard that supports that. Currently, only AMD’s X570 motherboards utilise PCIe 4.0, although we’ll likely see Intel make the jump too, hopefully in the not too distant future. There is also the issue of cooling, as M.2 SSDs can get quite hot and will thermal throttle to stay within safe parameters. As speeds continue to climb, we are also going to need to see more focus placed on M.2 SSD cooling in order to maintain these high speeds.
It's unknown when we can expect the first disks based on the Phison PS5018-E18.