IBM 00TK681 Chassis Management Card EMX0 The EMX0 PCIe Gen3 I/O expansion drawer (EMX0 PCIe3 expansion drawer) is a 482.6 mm (19 in), 4U PCIe Gen3 I/O drawer. Each EMX0 PCIe3 expansion drawer provides up to 12 PCIe Gen3 adapter slots. The EMX0 PCIe3 expansion drawer is connected to a system via one or more expansion drawer cable pairs. Each pair provides a single x16 PCIe Gen3 link between the system and the EMX0 PCIe3 expansion drawer. The number of extra PCIe slots that are provided and the number of expansion drawer cable pairs needed depends on the I/O module configuration of the EMX0 PCIe3 expansion drawer. If you have an 8408-44E system with system firmware FW860.10 or later installed, or a 9080-MHE, 9080-MME, 9119-MHE, or 9119-MME system with system firmware FW840.xx or later installed, you can connect the EMX0 PCIe3 expansion drawer to the system with the system power turned on. For instructions, see Connecting an EMX0 PCIe3 expansion drawer to your system with the system power turned on. Ensure that you have a PCIe3 cable adapter installed in the host system before you install the EMX0 PCIe3 expansion drawer. For all systems except the 8408-44E system that has an installation of system firmware FW860.10 or later installed, or the 9080-MHE, 9080-MME, 9119-MHE, or 9119-MME system that has an installation of system firmware FW840.xx or later installed, you must power off the system to install the PCIe3 cable adapter. To install another PCIe3 cable adapter to accommodate an EMX0 PCIe3 expansion drawer, see the following topics: If you must power off the system to install a PCIe adapter in your system, see PCIe adapters. If you can install a PCIe adapter when the system power is turned on, see Installing a part by using the HMC For PCIe adapter placement rules and slot priorities for your system or expansion drawer, see PCIe adapter placement rules and slot priorities.