MSI X299 PRO - DIMM Slots Configuration; Memory Module Installation Recommendation

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Overview of Components
DIMM Slots
B1 B2 A1 A2 C2 C1 D2 D1
Memory module installation recommendation
B1 B2 A1 A2 CPU Socket C2 C1 D2 D1
1 DIMM
Intel® Core™ X-series
10000/ 9000/ 78xx (above)
processors
2 DIMMs
3 DIMMs
4 DIMMs
5 DIMMs
6 DIMMs
7 DIMMs
8 DIMMs
DIMMC1
DIMMC1
DIMMA1