IBM 8685 Hardware Maintenance Manual - Page 64

v The 32-bit slot supports 5.0 V and universal PCI and PCI-X adapters; this slot does not support 3.3 V adapters. v The 64-bit slots support 3.3 V and universal PCI and PCI-X adapters; they do not support 5.0 V adapters. v If you install an optional IBM Remote Supervisor Adapter in this server, you must install the adapter in PCI slot 1. However, you can install other compatible adapters in this slot. If you install an optional IBM Remote Supervisor Adapter in the server, use the ribbon cable that comes with the adapter to connect the adapter to the system-management connector (J16) on the system board. The external power adapter that comes with the IBM Remote Supervisor Adapter is not required with this server. v If you install an optional Integrated xSeries Adapter (IXA) in this server, you must install the adapter in PCI-X slot 2 and move the jumper on J57 to pins 2 and 3 (J57 is located between PCI slots 1 and 2). IXAs are wide and require two adjacent slots; therefore, if you install an IXA in the server, you cannot install an adapter in PCI-X slot 3. In addition, you must remove the divider between PCI-X slots 2 and 3 before you can install an IXA in the server. Go to http://www.ibm.com/pc/us/compat/ on the World Wide Web for information about the IXAs that this server supports. See the documentation that comes with your IXA for additional information about IXAs. Attention: Although an optional IXA can be installed only in slots 2 through 3, it is not a hot-plug adapter. See "Installing an adapter" on page 55 for instructions for installing a non-hot-plug adapter. v The server might require additional power supplies if you install adapters that have electrical current requirements that exceed the installed power-supply capabilities. v The PCI bus configuration is: - Non-hot-plug, 32-bit PCI slot 1 (on PCI bus A, 33 MHz, 5.0 V) PCI bus A also includes the video controller. - Hot-plug, 64-bit PCI-X slots 2 and 3 (on PCI bus B, 100 MHz, 3.3 V) PCI bus B also includes the Ethernet controller. - Hot-plug, 64-bit PCI-X slots 4 and 5 (on PCI bus C, 100 MHz, 3.3 V) - Hot-plug, 64-bit PCI-X slots 6 and 7 (on PCI bus D, 100 MHz, 3.3 V) - SCSI controller (on a separate PCI bus operating at 66 MHz). If there is a PCI bus failure on the SCSI controller, the PCI-A error LED lights. Note: The SCSI controller is on PCI bus 1; PCI bus B is often referred to as bus 2; PCI bus C is often referred to as bus 3; and PCI bus D is often referred to as bus 4. However, the bus numbers vary according to the adapters that are installed. v If you install an adapter with a speed of less than 100 MHz, the speed of that PCI bus will be reduced to the speed of the slowest device on that bus. To maintain an optimum speed for the Ethernet controller on PCI bus B (PCI-X slots 2 and 3), install the following types of adapters in PCI-X slots 4 through 7: - Redundant array of independent disks (RAID) adapters - 33 MHz or 66 MHz speed adapters - PCI adapters v To assign system resources, the system scans the PCI and PCI-X devices in the following order: PCI slot 1, PCI-X slots 4 through 7, system board SCSI devices, 54 xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide