| Label |
Description |
| A |
PCI Express x1 bus add-in card connector |
| B |
Conventional PCI bus add-in card connector |
| C |
PCI Express x16 bus add-in card connector (x8 electrical; x16 compatible) |
| D |
Front panel audio header |
| E |
Conventional PCI bus add-in card connector |
| F |
PCI Express x1 bus add-in card connector |
| G |
PCI Express x16 bus add-in card connector |
| H |
Battery |
| I |
PCI Express x1 bus add-in card connector |
| J |
Rear chassis fan header |
| K |
Back panel connectors |
| L |
12 V processor core voltage connector (2 x 4 pin) |
| M |
LGA1155 processor socket |
| N |
VR status LEDs |
| O |
Processor fan header |
| P |
DIMM 3 (Channel A DIMM 0) |
| Q |
DIMM 1 (Channel A DIMM 1) |
| R |
DIMM 4 (Channel B DIMM 0) |
| S |
DIMM 2 (Channel B DIMM 1) |
| T |
Front chassis fan header |
| U |
Piezoelectric speaker |
| V |
Main power connector (2 x 12) |
| W |
LED2 (Power Fault) |
| X |
Onboard power button |
| Y |
Standby power LED |
| Z |
SATA 3.0 Gb/s connector through the PCH (black) |
| AA |
Intel Z77 Express Chipset |
| BB |
SATA 6.0 Gb/s connector through the PCH (blue) |
| CC |
SATA 3.0 Gb/s connector through the PCH (black) |
| DD |
SATA 6.0 Gb/s connector through a Marvel 88SE9172 controller (gray) |
| EE |
Alternate front panel power LED header |
| FF |
Front panel header |
| GG |
Power On Self Test (POST) code LED display |
| HH |
Front panel USB 2.0 connectors |
| II |
Chassis intrusion header |
| JJ |
Consumer IR receiver (input) header |
| KK |
Front panel USB 3.0 connector (blue) |
| LL |
Consumer IR transmitter (output) header |
| MM |
BIOS configuration jumper block |
| NN |
S/PDIF out header |
| OO |
Board status LEDs |
| PP |
Auxiliary fan header |
| QQ |
IEEE 1394a front panel header |
