|A converter MIGHT work; a PCI SATA controller card will ALWAYS work, but you have to be able to select SCSI in the Boot Order or similar settings in the mboard's bios Setup in order to be able to boot from a SATA drive that's attached to the PCI controller card.|
See this recent Topic, particularly Response 5
A side note - DO NOT install a PCI SATA controller card, or any card other than a PCI video card, in the last PCI slot closest to the center of the mboard. That PCI slot is forced to share it's IRQ with the video, and only PCI video cards are likely to not have problems when installed in that slot.
If you don't have an available PCI slot, or if you don't have one other than that one, if you have an available PCI-E X1 slot, there are also PCI-E X1 SATA controller cards available. The same applies regarding you needing to be able to select SCSI in the bios Setup if you want to be able to boot from a drive attached to the card.