This is the most thorough way to update these cards. Regarding the six pin power cable: This cable is only needed if your PCIe slot does not provide the required 27w of power. All PCIe 16x slots will be able to provide this.
Inclusions: 4x SAS 3 to 4x SATA Cable. Interface: SAS. Compatible Port: PCIe 3.0 x8. # of Ports: 16. PlusDrives is a division of UNIXSurplus, a large Server dealer in Silicon Valley, California. We specialize in used servers and switches.