31 6-pin power connector 2 (for graphics card) 32 Internal-storage-drive activity indicator connector33 4-pin power connector (for storage drive) 34 4-pin power connector (for storage drive)35 Front panel connector 36 BCA 2 connector37 BCA 1 connector 38 SATA 6 connector39 Thunderbolt™ control connector 40 Front USB 3.0 connector 241 Internal USB 2.0 connector 42 USB 3.0 extended connector43 Front USB 3.0 connector 1 44 15-in-1 card reader connector45 SATA 4 connector 46 SATA 3 connector47 SATA 2 connector 48 SATA 1 connector49 Power supply connector 50 SATA 5 connector51 eSATA/SATA connector 52 PCIe 3.0 x4 card slot 653 PCI card slot 5 54 PCIe 3.0 x16 card slot 455 Clear CMOS /Recovery jumper 56 PCIe 3.0 x8 card slot 357 PCIe 3.0 x16 card slot 2 58 PCIe 3.0 x16 card slot 159 Coin-cell battery 60 Memory fan connector 261 Microprocessor 2 (available on some models) 62 Rear-fan-assembly connector63 Serial port (COM1) connector 64 Microprocessor fan connector 28 P720 User Guide
