Please check the PCI card directly. The chip number, "INIC-1623T" or "INIC-1623TA2", is printed below the Initio logo on the chip. Choose the driver download that matches your PCI card.
Each PCI card provides two SATA ports. Up to two SATA enclosures can be connected via these two ports, (one to each port). Installing two SATA PCI cards on one machine is not recommended.