IBM System x3850 X6 24I/O expansion optionsThe server supports up to 11 PCIe slots plus dedicated Mezzanine LOM slot (12 total) as follows:In the Storage Book (standard in all models): Two PCIe 3.0 x8 slots for supported internal RAIDcontrollers and SAS HBAsIn the Primary I/O Book (standard in all models):Two PCIe 3.0 x16 slots (x16-wired), half length, full height, up to 75 W of poweroOne PCIe 3.0 x16 (x8-wired), half length, full height, up to 75 W of poweroOne mezzanine LOM 2 (ML2) slot for network adapters with the new ML2 form factor (PCIe 3.0ox8)Two optional I/O Books, each with three slots, all full height. Optional I/O Books are enabled forhot-swap.The following figure shows the Primary I/O Book with the air baffle raised to show the internals.Figure 8. Primary I/O BookOptional I/O Books can be either of:Half-length I/O Book:Two PCIe 3.0 x8 slots (x8 wired)oOne PCIe 3.0 x16 slot (x16 wired)oFull-length I/O Book:Two PCIe 3.0 x16 (x16 wired)oOne PCIe 2.0 x8 slot (x4 wired)o