2. SYS_FAN 3-pin system cooling fan connector
3. CPU_FAN 4-pin CPU cooling fan connector
4. DDR3_1~4 240-pin DDR3 Module slots
5. ATX_POWER Standard 24-pin ATX power connector
6. USB3F Front panel USB 3.0 header
7. CASE CASE open header
8. ME_UNLOCK ME unlock header-for factory use only
9. SATA1~4 Serial ATA 6Gb/s connectors
10. SATA5~6 Serial ATA 3Gb/s connectors
11. F_PANEL Front panel switch/LED header
12. F_USB1 Front panel USB 2.0 header (Gray header supports EZ Charger)
13. F_USB2 Front panel USB 2.0 header
14. TPM Trusted platform module header
15. LPT Parallel port header
16. SPDIFO1 SPDIF out header
17. SPK Speaker header
18. CIR1 Consumer Infrared
19. COM Onboard serial port header
20. CLR_CMOS Clear CMOS jumper
21. PCIEX16_S1 PCI Express Gen2 x4 slot
22. F_AUDIO1 Front panel audio header
23. PCI1 32-bit PCI add-on card slot
24. PCIE1 PCI Express Gen2 x1 slot
25. PCIEX16 PCI Express Gen3 x16 slot for graphics interface
26. ATX12V 4-pin +12V power connector