HP rp3440 User Service Guide, Sixth Edition - HP 9000 rp3410/rp3440 - Page 72

Memory Loading Rules and Performance Guidelines • DIMMs must be installed in server load sequence (the first DIMM must be in the first slot, the second DIMM must be in the second slot, and so on). • A minimum of 512 MB (2 x 256 MB DIMMs in a model A7136A server) or 1 GB (4 x 256 MB DIMMs in a model A7136B server) of memory must be installed in a HP 9000 rp3410 server. • Maximum memory is 6 GB. • A minimum of two DIMMs (one pair) is required in the model A7136A server. • A minimum of four DIMMs (one quad) is required in the model A7136B server. • All DIMMs within a quad must be identical. • Memory can be ordered in amounts of 1 GB (4 x 256 MB), 2 GB (4 x 512 MB), 4 GB (4 x 1 GB), 8 GB (4 x 2 GB), and 16 GB (4 x 4 GB). • Memory is loaded across both memory busses (two DIMMs on each bus) to ensure maximum bandwidth and performance. • Total memory bandwidth is 8.5 GB/s, split across two 4.25 GB/s memory buses. • Open page memory latency is 80 nanoseconds. rp3440 Memory Configuration The HP 9000 rp3440 supports DDR SDRAM DIMMs with ECC and chip spare protection. This server has 12 DIMM slots, but maximum system memory is 32 GB due to cooling limitations. Memory must be installed as quads (groups of four). This allows memory configurations of four, eight, or twelve DIMMs. Thus, the HP 9000 rp3440 server must include a minimum of 1 GB and can include up to 24 GB of memory in combinations of 256 MB, 512 MB, 1 GB, and 2 GB DIMMs, or 32 GB of memory consisting of eight 4 GB DIMMs. Different size DIMMs can be installed in the server (except when 4 GB DIMMs are used), but all four DIMMs in a quad must be identical. Memory Loading Rules and Performance Guidelines • Minimum memory is 1 GB (4 x 256 MB). • Maximum memory is 32 GB (8 x 4 GB installed in the first eight slots-the remaining slots must remain empty if 4 GB DIMMs are installed). • Memory DIMMs must be installed in groups of four (quads). • All DIMMs within a quad must be identical. • Memory must be loaded in the specific order outlined on the system board. • Memory can be ordered in amounts of 512 MB (2 x 256 MB), 1 GB (4 x 256 MB), 2 GB (4 x 512 MB), 4 GB (4 x 1 GB), 8 GB (4 x 2 GB), and 16 GB (4 x 4 GB). • Each quad of memory is loaded across both memory buses (two DIMMs on each bus) to ensure maximum bandwidth and performance. • Total memory bandwidth is 8.5 GB/s, split across two 4.25 GB/s memory buses. • Open page memory latency is 80 nanoseconds. The memory subsystem supports chip-spare functionality. Chip spare enables an entire SDRAM chip on a DIMM to be bypassed (logically replaced) in the event that a multi-bit error is detected on that SDRAM. In order to use the chip spare functionality, only DIMMs built with x4 SDRAM parts can be used, and these DIMMs must be loaded in quads (two DIMMs per memory cell, loaded in the same location in each memory cell). System Firmware Requirements If you are using 4 GB DIMMs in a HP 9000 rp3440 server, system firmware must be greater than revision 44.24. Use the BCH FV command, or the iLO MP SR command to display the system firmware revision status. If necessary, use the iLO MP SR command to upgrade system firmware. (Detailed instructions are downloaded with the upgrade.) 72 Installing the System