Intel SR1325TP1 - Entry Server Platform User Manual page 24

Server Platform Features
NOTES
Although the server board architecture allows the user to mix various sizes of
DIMMs between channels, DIMMs must be identical within each bank.
To be fully compliant with all applicable DDR SDRAM memory
specifications, the board should be populated with DIMMs that support the
Serial Presence Detect (SPD) data structure. This allows the BIOS to read the
SPD data and program the chipset to accurately configure memory settings
for optimum performance. If non-SPD memory is installed, the BIOS will
attempt to correctly configure the memory settings, but performance and
reliability may be impacted or the DIMMs may not function under the
determined frequency.
For ECC functionality, all installed DIMMs must be ECC. If both ECC and
non-ECC DIMMs are used, ECC will be disabled and will not function.
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Intel Entry Server Platform SR1325TP1-E User Guide