Thanks for your reply.
I tried what you said and installed the driver correctly in Windows while the SSD was in Bay 1. I can see the Velocity card in Device Manager and it was in PCIe slot 2. Still a no-go unfortunately. No other drives are connected. No other PCIe cards apart from my gfx card in slot 1. So weird.
I'll try my luck with a DUO. I'll run Sierra on one SSD and Windows 10 on another SSD with it. It would be nice if my Mac Pro 3,1 had more than 2 x PCIe 2.0 slots, then I could use another slot for this Solo x2. No real benefit compared to the existing Sata2 drive bay slots. Ah well, the Solo x2 might come in handy somewhere else some day.
Hi all.
For what it is worth. To anyone coming to this thread looking to find a solution to the same problem I have with the Solo X2.
These instructions (although they did not work for me on my 3,1) are from Apricorn Tech Support. Maybe it can help you.
We recommend the following steps for the X2 and boot camp:
Boot Camp instructions for Mac Pro3,1 4,1 5,1 using Velocity Solo X1 or X2.
*Remove any other 3rd party products from the Mac. Particularly other PCI expansion cards. Add them back in one at a time after completing these steps.
1. With a OSX SSD mounted to an internal SATA port start the Boot Camp Assistant. The Boot Camp Assistant will partition the drive in preparation for the Windows installation, and will download Mac Boot Camp drivers for Windows. Save the Boot Camp files to a USB drive.
2. Once the downloading and partitioning are done the Boot Camp Assistant will reboot the computer from the Windows installation DVD. Install Windows as normal.
3. When windows finishes installing, install the Boot Camp support files into Windows you downloaded in step 1. Reboot as needed. Apply all Windows Updates.
4. Shut down Windows and then install the blank Solo into an available PCIe slot. (with no drives attached)
5. Boot Windows and let it automatically install drivers for the new storage control it detects. (the Solo)
6. Use the Boot Camp control panel from the system tray to reboot into OSX.
7. Enter the System preferences in OSX and make sure that OSX is picked as the startup disk. Shutdown OSX.
8. Move the SSD to the Solo.
9. Boot up OSX from the SSD mounted on the Solo.
10. Use the Boot Camp control panel to choose between operating systems. (This is in Windows OS after you install Bootcamp Support drivers via the Bootcamp.exe - Find it in your Windows Control Panel.)