Intel SE7320VP2 User Guide - Page 23

Server Board Features DIMMs must meet the following requirements: ƒ Use only DDR266 or DDR33, registered DDR DIMM modules ƒ Use only DIMMs that comply with the DDR specifications. ƒ DDR266 and DDR333 memory can be mixed on the server board, but when mixing DIMM types, DDR333 memory will be treated as DDR266. ƒ Use only DIMMs with DIMM organization of x72 ECC ƒ Use only 184-pin DIMMs ƒ Use only DIMMs with the capacities outlined in the following table Table 7. Memory Capacity Support DIMM Type 256MB 512MB X8, single row 256MB 512MB X8, double row 512MB 1GB X4, single row 512MB 1GB X4, stacked, double row 1GB 2GB 1GB 1GB 2GB 2GB 4GB In determining your memory requirements, the need for memory sparing or memory mirroring must be considered. For a complete list of supported memory DIMMs, see the links under "Additional Information and Software." Memory Sparing and Mirroring The Intel® E7320 chipset supports memory mirroring and memory on-line sparing. Both memory mirroring and memory on-line sparing provide a way to prevent data loss in case a DIMM fails. With memory mirroring the system maintains two copies of all data in the memory subsystem. If a DIMM fails, the data is not lost because the second copy of the data is available from the mirrored DIMM in the opposite channel. The system will not fail due to memory error unless both the primary and the mirrored copy of the data become corrupt at the same time. In a mirrored system, the maximum usable memory space is one-half of the installed memory, with a minimum of four DIMMs installed. One method for memory mirroring is available, with four identical DIMMs are used in DIMM sockets 1A, 1B, 2A, and 2B. ƒ If the DIMM in socket 1A fails, the DIMM in socket 2B takes over. ƒ If the DIMM in socket 1B fails, the DIMM in socket 2A takes over. 23