MB doesn't show PCI SSD as drive

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I have installed a PCI-SSD and want to use it as my boot C drive, my MB says it will accpt a PCI for boot, & I currently have a sata ssd as my C drive.
Using Win7 the PCI doesn't show as a drive in "my Computer" but if I go into the device mngr "dskdrives" it does show up. It doesn't show up in the bios under drives or boot preferences.
If I reconfigure and reinstall win7 with just the pci ssd will it automatically install or do have to assign a drive leter to the PCI card and how?