I have Mojave booting and running from a PCIe M.2 NVME on Mac Pro 5,1 with RX-580. I have a second PCIe M.2 NVME, and I want to run Windows off that. I can boot into a Windows 10 installation on an IDE drive mounted on sled 2, using Abry Franco's excellent boot manager. https://abdyfran.co/projects/boot-manager. But it runs very slow, so I picked up a second PCIe M.2 NVME and PCIe card to host the Windows installation. To my surprise, I can't get Windows to install from the DVD -- the installer says Windows is not supported from this kind of drive. I played around with converting from Master Boot Record partition to GPR, no joy. Next, I tried using MiniTool Partition Wizard 11 to clone the working Windows 10 drive onto the PCIe M.2 NVME. Boot Manager sees the new Windows installation (called Bootcamp, because I installed the iMac Pro 1,1 drivers on the Windows partition using Brigadier), but I can't boot into it. When I try, I just get a black screen that says "Insert Bootable Disk." I'm sure I've seen someone on here say they have figured out how to make this work, but I can't seem to find directions how to make it work. Thanks!