In any case, users get no fewer than four physical PCI Express x16 slots to play with, plus a PCIe x1 and a couple of old-fashioned 32-bit PCI slots. On the connectivity front, the GA-P55A-UD7 carries 10 internal Serial ATA ports (including two with support for 6Gbps transfer rates), two external SATA ports, and three other pairs of ports on the external I/O panel: USB 3.0, FireWire, and Gigabit Ethernet. This being one of Gigabyte's "333" offerings, the USB ports also have triple the normal power delivery.
Source: The Tech Report