Readycache connected to a raid card (jbod mode) still help boot?

I’m a bit low on sata ports on the mb, but i have a port free on my pci-e raid card, it seems to work ok in windows, but does it actually help during boot?  Or does windows load that raid driver pretty early in the boot process?

Additional issue, it seems rebooting sometimes it doesn’t detect the drive after boot, by this I mean the rocketraid 2300 does show it during boot detect, but once in windows express cache says theres no valid drive after it loads up, I reboot again, and it shows up again, but of course it has to rebuild.

Anyone else have this problem?