Lenovo ThinkCentre M50 User Manual - Page 100
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The following illustration shows the locations of parts on the system board. 1 Microprocessor 2 DIMM connector 1 3 DIMM connector 2 4 DIMM connector 3 5 DIMM connector 4 6 Power connector 7 Diskette drive connector 8 PATA primary IDE connector 9 PATA secondary IDE connector 10 SATA 1 IDE connector 11 SATA 2 IDE connector 12 Promise of value (POV) daughter card (some models) 13 Clear CMOS/Recovery jumper 14 Battery 15 SCSI LED connector 16 PCI slots 17 Front panel audio connector 18 CD-ROM audio connector 19 AGP slot Installing memory Your 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 DIMMs, the following rules apply: v System memory is divided into two channels (channel A and B). DIMM connectors 1 and 2 are channel A, and DIMM connectors 3 and 4 are channel B. v If DIMM 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 GB (when available) DIMMs in any combination. v DIMMs are 25.4 mm (1.0 inch) in height. 84 User Guide Note: Only DDR SDRAM DIMMs can be used.