Can Sun Fire X4100/X4200 Server memory DIMMs be interchanged with the Sun Fire X4100 M2/X4200 M2 Server memory DIMMS?
No. The two server series use different DIMMs. The Sun Fire X4100 and Sun Fire X4200 use DDR1/400 registered DIMMs while the Sun Fire X4100 M2 and Sun X4200 M2 Servers take advantage of the Opteron Rev F CPU’s DDR2 memory controller and use DDR2/667 DIMMs. In all cases, the systems have 4 memory DIMM slots per CPU socket and the DIMMs should be installed in pairs for 128-bit memory access. The systems will run with only 1 DIMM installed but memory access speed will be diminished. For the Sun Fire X4100 M2 and X4200 M2 servers, the 2 GB and 4GB DIMMs are dual ranked. If more than 4 dual ranked DIMMs are populated per CPU, DDR2 clocking drops from 667 MHz to 533MHz.
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