CalDigit RAID Card - Manual (Page 17)

17 A. MacPro
Note:
It maybe necessary for you to disentangle the iPass cable
from other cables running through the same area so that the loose
end of the iPass cable extends toward the PCI connectors as far as
possible.
If you want to use BootCamp in your Mac Pro, you will need to
purchase an optional CalDigit Mini-SAS Cable, Part# CBMiniSAS-
BC, SKU# 702101. You will need to connect it to the CalDigit RAID
Card's J19 Mini-SAS port at one end. And connect the other end to
the iPass connector on MacPro's motherboard. Please make sure
the jumper is installed on 1, 2 as shown below.