Memory - Dell PowerEdge R820 Technical Manual

More memory options are available than ever before with the Dell PowerEdge R820—greater
capacities, higher frequencies, and more flexibility. The R820 supports up to 1.5 TB of memory
(48 DIMM slots) and speeds of up to 1600 MT/s, providing high performance in a variety of
applications.
In addition to supporting existing unbuffered DIMMs (UDIMM) and registered DIMMs (RDIMM), the
R820 supports load-reduced DIMMs (LRDIMM), which use a buffer to reduce memory loading and
provide greater density, allowing for the maximum platform memory capacity. High memory density
provides a richer, no compromise virtualization environment. While the buffer in the LRDIMM
reduces memory bus loading and allows 50% higher capacity in a system, the buffer does introduce
additional latency, which will have a small impact on system performance.
Increase your uptime and reduce data loss with RAS features like memory mirroring, sparing, and
many others. RAS aids in the rapid and accurate diagnosis of faults that require service, increasing
your memory reliability.
The R820 supports the memory technologies shown
Feature
Register
Buffer
Frequencies
Ranks supported
Capacity per DIMM
Maximum DIMMS per channel
DRAM technology
Temperature sensor
ECC
SDDC
Address parity
17 PowerEdge R820 Technical Guide
Table 8.
in
UDIMM RDIMM
No Yes
No No
800, 1066, or 800, 1066, 1333, or
1333MT/s 1600MT/s
1 or 2 1, 2, or 4
2 or 4GB 2, 4, 8, 16, or 32GB
2 3
x8 x4 or x8
Yes Yes
Yes Yes
Yes (with advanced
Yes
ECC mode)
Yes Yes
LRDIMM
Yes
Yes
1066 or 1333MT/s
4
32GB
3
x4
Yes
Yes
Yes
Yes