It may work into your setup, I won't doubt that. But not officially supported, and most cMP users have problem of that.
This is the TempoSSD Pro PLUS manual
http://www.sonnettech.com/support/downloads/manuals/tempo_ssd_pro_plus_qsg.pdf
Which clearly stated that Windows booting only support on PC. But for OSX booting, it says Mac Pro. And long time ago. I contacted their tech support, confirmed Windows booting is not supported for cMP. Even though the TempoSSD Pro PLUS launch after I consult them (about TempoSSD, not the pro version). But the wording inside both manuals are the same. So, I won't assume Mac Pro is now included in the terms "PC".
Besides, SSD mounted on the Tempo card will be considered external in cMP. Which is another reason why Windows booting is not supported natively.
This one may be similar to the boot manager issue (only exist on 5,1). Sonnet officially admit that boot manager won't work on 5,1. I tried that myself. My Tempo card can always shows boot manager with 4,1 firmware. But once flashed to 5,1, it breaks. However, I can bring it back with some specific SMC / PRAM reset procedure. So, it can actually work in some cases. But not really officially supported. And in most case, just as per Sonnet's statement. It won't work.
In fact, just few hours ago, in another forum, I just read another post about his cMP is facing this exact problem (can't boot Windows from his TempoSSD Pro card). So, I am quite sure Windows booting is not officially supported, and the exact required condition still hasn't been figured out yet.
May I know if you install Windows directly on the SSD that mount on the Tempo card? Or clone the Windows onto it? Or install Windows via the native SATA port, then transfer the SSD onto the Tempo card?
Form memory, even the Velocity card officially says can boot Windows, but still lots of users has issue on this area. And still can't install Windows directly on a SSD that already mounted onto the card, but need work around to make it work.
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