Intel SE7525GP2 Product Specification - Page 39
Memory RASUM Features
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Intel® Server Boards SE7320SP2 and SE7525GP2 Functional Architecture Table 8. Suggested SEC Threashold Prescale Settings DIMM Size 128 MB 256 MB 512 MB 1 GB 2 GB 4 GB SPARECTL SEC Prescale Value 128 64 32 16 8 4 SPARECTL SEC Prescale Unit Thresh_SEC Count on a per DIMM Basis 7h = week 4 7h = week 4 7h = week 4 7h = week 4 7h = week 4 7h = week 4 In both runtime mode and non-RAS mode, the chipset counter defines the number of CMEs that can occur on each individual DIMM. The counter for the DIMM is also dependent on the DIMM size. The table below shows the resulting threshold values based on the DIMM size. Table 9. DIMM Threshold Values by DIMM Size DIMM Size 64 MB 128 MB 256 MB 512 MB 1 GB 2 GB 4 GB Threshold Value 4 4 4 x 2 4 x 4 4 x 8 4 x 16 4 x 32 Example: If the DIMM in socket 1A 256 MB, its counter value is 08h. If the CME count that occurs on this DIMM is over 08h, then the DIMM 1A LED will be lit and the CME logging and detection will be disabled by BIOS. If the DIMM in socket 2A is 512 MB, its counter value is 10h. If the CME count that occurs on this DIMM is over 10h, then the DIMM 2A LED will be lit and the CME logging and detection will be disabled by BIOS. 3.5.5 Memory RASUM Features The Intel® E7320 MCH and Intel E7525 MCH support several memory RASUM (Reliability, Availability, Serviceability, Usability, and Manageability) features that have traditionally been found only on high end server systems. These features include x4 SDDC for memory error detection and correction, Memory Scrubbing, Retry on Correctable Errors, Integrated Memory Initialization, and DIMM Sparing. The following sections describe how each is supported on these server boards. Revision 4.0 27