We are running the Super Workstation 5046A-X which is based on your C7X58 Motherboard. Currently Slot 6: PCIe x16 and slot 5: PCIe x4 are in use. We would like to add another controller card, Adaptec RAID 2405 which is a PCIe x8 card using the other PCIe x16 slot available. Is it possible?
Yes, you can use PCI-e x 8 card in PCI-e x16 slot of C7X58 motherboard.