Memory; Supported Memory; Table 7. Memory Technologies Supported - Dell PowerEdge R820 Technical Manual

5 Memory

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 1.5TB of memory
(48 DIMM slots) and speeds of up to 1600MT/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 reliability, availability and serviceability (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.

Supported memory

The R820 supports the memory technologies shown
Feature
Register
Buffer
Frequencies*
Ranks supported
Capacity per DIMM
Maximum DIMMs per channel
DRAM technology
Temperature sensor
Error Correction Code (ECC)
Single Device Disable Code
(SDDC)
Address parity
*Although the R820 supports DIMM speeds lower than 1333MT/s, you can only purchase this system with DIMM
speeds of 1333MT/s and 1600MT/s on Dell.com/PowerEdge.
17 PowerEdge R820 Technical Guide
Table 7. Memory technologies supported
RDIMM
Yes
No
1333 or 1600MT/s
1, 2 or 4
4, 8, 16 or 32GB
3
x4 or x8
Yes
Yes
Yes
Yes
Table 7.
in
LRDIMM
Yes
Yes
1333 or 1600MT/s
4
32GB
3
x4
Yes
Yes
Yes
Yes