User Guide

Memory
RDIMMs 2 GB, 4 GB, 8 GB, or 32 GB single-, dual-, or quad-ranked
16 GB single- or dual-ranked
UDIMMs 2 GB or 4 GB
Minimum RAM 2 GB with a single processor
4 GB with two processors
Maximum RAM
LRDIMMs Up to 1536 GB (PowerEdge R720xd with 2.5 inch hard-
drive configuration)
RDIMMs Up to 512 GB
UDIMMs Up to 64 GB
Drives
Hard drives
(PowerEdge R720)
Four–hard-drive systems
Up to four 3.5 inch, internal, hot-swappable SATA hard
drives in hard-drive slots 0 through 3 (hard-drive slots 4
through 7 do not support any hard drives and are installed
with a hard-drive blank).
NOTE
: Four–hard-drive systems support software
RAID. For more information on software RAID, see the
Dell PowerEdge RAID Controller (PERC) documentation
at support.dell.com/manuals.
Eight–hard-drive systems Up to eight 3.5 inch or 2.5 inch, internal, hot-swappable SAS,
SATA, or Nearline SAS hard drives in hard-drive slots 0
through 7.
Sixteen or eight plus eight–hard-drive systems Up to sixteen 2.5 inch, internal, hot-swappable SAS, SATA,
SATA SSD, or Nearline SAS hard drives in hard-drive slots 0
through 15 or 0 through 7 and 0 through 7.
Twelve–hard-drive systems Up to eight 2.5 inch, internal, hot-swappable SAS, SATA,
SATA SSD, or Nearline SAS hard drives in hard-drive slots 0
through 7 (hard-drive bay 1) and up to four 2.5 inch Dell
PowerEdge Express Flash devices (PCIe SSDs) in hard-drive
slots 0 through 3 (hard-drive bay 2).
Hard drives
(PowerEdge R720xd)
Twelve plus two–hard-drive systems Up to twelve 3.5 inch, internal, hot-swappable SAS, SATA,
SATA SSD, or Nearline SAS drives, and two optional 2.5 inch
back-accessible SAS, Nearline SAS, or SSD hard drives in
hard-drive slots 0 through 11 and 12 through 13.
Twenty-four plus two–hard-drive systems Up to twenty-four 2.5 inch, internal, hot-swappable SAS,
SATA, SATA SSD, or Nearline SAS drives in hard-drive slots
140