1.PCI slot (slot 6)
3.PCIe 3.0 x16 slot (slot 4)
5.PCIe 3.0 x16 slot (slot 2)
7.
9.CPU2 fan connector
11.DIMM slots (available only when optional second processor is installed)
13.CPU1 fan connector
15.HDD1 fan connector
17.DIMM slots
19.
21.thunderbolt sideband connector
23.
25.remote power button connector
27.USB 3.0 front panel connector
29.password jumper
31.
33.internal USB type A connector
2.PCIe x16 slot (PCIe 2.0 wired as x4) (slot 5)
4.PCIe 2.0 x1 slot (slot 3)
6.PCIe x16 slot (PCIe 3.0 wired as x8) (slot 1)
8.DIMM slots (available only when optional second processor is installed)
10.processor socket 2
12.
14.CPU1 power connector
16.
18.processor socket 1
20.DIMM slots
22.HDD temp sensor
24.internal speaker connector
26.front panel I/O connector
28.internal USB 2.0 connector for flexbay
30.main power connector
32.SATA connectors
34.CPU2 power connector
37