Lenovo ThinkCentre M50 Hardware Maintenance Manual (HMM) - Page 44
Identifying, parts, system, board, machine, types, Replacing, memory
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Identifying parts on the system board (all machine types) 1 Microprocessor 2 Fan sink connectors 3 Memory connector 1 4 Memory connector 2 5 Memory connector 3 6 Memory connector 4 7 Power connector 8 Diskette drive connector 9 PATA primary IDE connector 10 PATA secondary IDE connector 11 SATA 1 IDE connector 12 SATA 2 IDE connector 13 Security daughter card connector 14 Clear CMOS/Recovery jumper 15 Battery 16 SCSI LED connector 17 PCI slots 18 Front panel audio connector 19 CD-ROM audio connector 20 AGP slot Replacing memory (all machine types) The computer has four connectors for installing dual inline memory modules (DIMMs) that provide up to a maximum of 4.0 GB of system memory. When installing memory modules, the following rules apply: v System memory is divided into two channels (channel A and B). memory connectors 1 and 2 are channel A, and memory connectors 3 and 4 are channel B. v If memory connectors 1 and 3 (or 2 and 4) are filled with the same technology and size of memory, the system operates in dual channel mode. v Use 2.5 V, 184-pin, 333 MHz double data rate synchronous dynamic random access memory (DDR SDRAM). v Use 128 MB, 256 MB, 512 MB or 1.0 GB (when available) memory modules in any combination. v Memory modules are 25.4 mm (1.0 inches) in height. 38 Hardware Maintenance Manual