Western Digital is preparing to update its client SSD lineup with a new flagship product, the WD Black SN850X. The drive was referenced in a December 10 certification filing with the PCI-SIG. The drive unsurprisingly features a PCI-Express 4.0 x4 interface. Nothing else is known about the drive, but the "X" in its name could signify a performance uplift over the current WD Black SN850 from an updated controller, a newer generation of NAND flash, or better stock cooling. Interestingly, the listing also references a drive called "SN820," which could be an "unbranded" successor to the PC SN810, a drive the company sells to system integrators and OEMs.
