HP (Hewlett-Packard) D3J88UT#ABA ユーザーズマニュアル

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HP Z820 Workstation DIMM installation order 
Install DIMMs in this order.
NOTE:
If you install DIMMs of different sizes, load them in order of size, starting with largest and
finishing with the smallest (largest in DIMM 1, smallest in last loaded DIMM).
Figure 3-11
  Single-processor DIMM installation order
Figure 3-12
  Dual-processor DIMM installation order
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Chapter 3   Component Replacement Information and Guidelines