Only the 8 GB Feature #4526 (2 x 4 GB DIMM) can be installed as a single feature in DIMM pairs,
and only for the first two memory features installed. All subsequent memory features must be
installed in quads (2 x feature).
DIMMs on a given memory card can differ from DIMMs on other memory cards.
DIMMs at Slot 1, 2, 3 & 4 on the same memory card must be identical. However, they can differ
from the four DIMMs at Slot 5, 6, 7 & 8 on the same memory card.