d. Press firmly on the captive screws and tighten them, alternating among thescrews on opposite sides of the heat sink until they are tight. Do notovertighten the screws by using excessive force.10. Reinstall the air baffle for microprocessor 2 (see step1 on page 27).If you have other devices to install or remove, do so now. Otherwise, go to“Completing the installation” on page 27.Installing an adapterThe following notes describe the types of adapters and riser cards that the serversupports and other information that you must consider when you install an adapter:v Locate the documentation that comes with the adapter and follow thoseinstructions in addition to the instructions in this section. If you must change theswitch settings or jumper settings on the adapter, follow the instructions thatcome with the adapter.v The server has one PCI Express (PCIe) x16 riser-card connector, one PCIe x8riser-card connector, and one Hyper Transport (HTX) riser-card connector. Theseconnectors support half-length riser cards.v All PCIe devices in the server must conform to the PCIe based specification,revision 1.1 compliant requirements.v If you plan to install an adapter in the server, you must install the adapter on ariser card that the server supports. The server supports a maximum of two risercards and two adapters.– You can install a PCIe x16 riser card in its designated connector in the server.In addition, you can install either a PCIe x8 riser card or an HTX riser card inits designated connector in the server.– You can install a half-length adapter on the PCIe x16 riser card. In addition,you can install a half-length adapter on either the PCIe x8 riser card or theHTX riser card. The server does not support both a PCIe x8 adapter and anHTX adapter in the same configuration.v The server is designed specifically for PCIe x16, PCIe x8, and HTX adaptersupport. The server supports the following adapter configurations:– The PCIe x16 riser card supports PCIe x16, x8, x4, and x1 adapters.– The PCIe x8 riser card supports PCIe x8, x4, and x1 adapters.– The HTX riser card supports only HTX adapters.Important: For the most current list of supported adapters, seehttp://www.ibm.com/servers/eserver/serverproven/compat/us/.v The server does not support the following types of adapters:– 5.0-V-only adapters– PCI adapters– PCI-X adapters– The optional IBM Remote Supervisor Adapter II SlimLine(systems-management adapter)v The integrated video controller is on the PCI bus. The integrated Ethernetcontrollers are on the PCI-X 100 MHz bus. The integrated SATA controller is onthe SATA bus. The PCIe x16 riser-card slot is on the PCIe x16 bus. The PCIe x8riser-card slot is on the PCIe x8 bus. The HTX riser-card slot is on the HTX bus.v The server scans PCIe and HTX slots to assign system resources. By default,the server starts (boots) devices in the following order: PCIe, PCI-X, and PCIdevices; HTX devices; then, IDE and SATA devices.24 System x3455 Types 7984 and 7986: Installation Guide