Reference Guide

Table 5. Expansion card riser configurations
Riser PCIe slot on the
expansion card
riser
Processor
connection
PCIe slots on riser
(Height)
PCIe slots
on riser
(length)
Link width Slot
width
Riser 2
(IO_RISER2)
Slot 8 Processor 3 full height 3/4 length x16 x16
Slot 9 Processor 3 full height half length x16 x16
Slot 10 Processor 3 full height half length x16 x16
Riser 3
(IO_RISER3)
Slot 11 Processor 4 full height 3/4 length x16 x16
Slot 12 Processor 4 full height half length x16 x16
Slot 13 Processor 4 full height half length x16 x16
Memory specifications
Table 6. Memory specifications
Memory
module
sockets
DIMM type
DIMM
rank
DIMM
capacity
Dual processors Quad processors
Minimum
RAM
Maximum
RAM
Minimum
RAM
Maximum RAM
Twenty
four 288-
pins
LRDIMM
Octa
rank
128 GB 256 GB 3 TB 512 GB 6 TB
Quad
rank
64 GB 128 GB 1.5 TB 256 GB 3 TB
RDIMM
Single
rank
8 GB 16 GB 192 GB 32 GB 384 GB
Dual rank 16 GB 32 GB 384 GB 64 GB 768 GB
Dual rank 32 GB 64 GB 768 GB 128 GB 1.5 TB
Dual rank 64 GB 64 GB 768 GB 128 GB 1.5 TB
NVDIMM-N
Single
rank
16 GB
16 GB 192 GB Supported on the system board only (No
NVDIMM-N on PEM)
DCPMM
NA 128 GB
RDIMM:
384 GB
LRDIMM:
1536 GB
RDIMM: 384
GB
LRDIMM: 3072 GB
DCPMM:
1536 GB
DCPMM:
1536 GB
DCPMM: 248
GB
DCPMM: 3072 GB
NA 256 GB
RDIMM:
192 GB
LRDIMM:
1536 GB
RDIMM: 384
GB
LRDIMM: 3072 GB
DCPMM:
2048 GB
DCPMM:
3072 GB
DCPMM:
4096 GB
DCPMM: 6144 GB
NA 512 GB
RDIMM:
384 GB
LRDIMM:
1536 GB
RDIMM: 768
GB
LRDIMM: 3072 GB
DCPMM:
4096 GB
DCPMM:
6144 GB
DCPMM:
8192 GB
DCPMM: 12,288 GB
NOTE: 8 GB RDIMM and NVDIMM-N must not be mixed.
NOTE: NVDIMM-N memory modules must be installed only on the memory sockets available on the system board.
NOTE: The DIMM slots are not hot-pluggable.
8 PowerEdge R940 technical specifications