Legit Reviews checked out the WD_Black AN1500 NVMe SSD RAID Card
A quote from the article:
Western Digital Goes PCIe 3.0 x8 with AN1500 AIC PCI Express Gen 4.0 might be all the rage these days, but Western Digital is by no means giving up on the PCIe Gen3 interface that is used on millions of desktop PCs. Proof of that is the introduction of the WD_Black AN1500 NVMe SSD Add-in-Card ...moreWD_Black AN1500 NVMe SSD RAID Card Review