Compaq AP550 Compaq Professional Workstation AP550 Maintenance & Service G - Page 67

3-34 Compaq Professional Workstation AP550 Maintenance and Service Guide DIMM Location and Configurations SDRAM Expansion Boards DIMM-based workstation models come with a synchronous dynamic random access memory (SDRAM) expansion boards installed that supports at least 64-megabyte of Error Checking and Correcting (ECC) Dual Inline Memory Modules (DIMMs). Figure 3-30. Overview of two SDRAM expansion boards installed in alternating RIMM sockets containing one DIMM on each board The following configuration guidelines must be followed when replacing SDRAM expansion boards. Memory Channel Channel A Channel B Table 3-7 SDRAM Expansion Boards Configurations RIMM Slot XMM1 SDRAM RIMM Slot XMM2 CRIMM RIMM Slot XMM3 SDRAM RIMM Slot XMM4 CRIMM NOTE: CRIMMs must populate Empty RIMM slots on a system board.