System Boards3-1Chapter 3 System BoardsThe system boards consist of the main board, the memory board, theSCSI backplane board, and the LCD display module. This chapterdiscusses the system board configurations in detail.3.1 Main BoardThe main board has the following major components:• Four Slot 2 CPU (Central Processing Unit) connectors thatsupport one, two, three, or four Intel Pentium II Xeon processorsand the next generation of Pentium processors:• Intel Pentium II Xeon running at 400 with integrated 512Kand 1MB L2 write-back cache• Intel Pentium II Xeon running at 450 with integrated 512K,1MB, and 2MB L2 write-back cache• One VRM (Voltage Regulator Module) for each CPU andone VRM for the L2 cache of two CPUs• 256-KB Flash ROM for system BIOS• Supports two PCI buses through one PXB (PCI Expander Bridge)• System clock/calendar with battery backup• One 68-pin Wide SCSI connector for each SCSI channel• One narrow SCSI connector for connecting legacy SCSIdevices, such as SCSI CD-ROM, DAT drives, etc.• Server management functions• PCI SVGA on-board, supports up to 1024 x 768 resolution• Onboard 2MB VGA RAM• Enhanced IDE hard disk and diskette drive interfaces• PCI local bus IDE (Integrated Device Electronics) controller