Dell PowerEdge R820 - 2 Using The System Setup And Boot Manager

17 PowerEdge R820 Technical Guide
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 in Table 7.
Table 7. Memory technologies supported
Feature
RDIMM
LRDIMM
Register
Yes
Yes
Buffer
No
Yes
Frequencies*
1333 or 1600MT/s
1333 or 1600MT/s
Ranks supported
1, 2 or 4
4
Capacity per DIMM
4, 8, 16 or 32GB
32GB
Maximum DIMMs per channel
3
3
DRAM technology
x4 or x8
x4
Temperature sensor
Yes
Yes
Error Correction Code (ECC)
Yes
Yes
Single Device Disable Code
(SDDC)
Yes
Yes
Address parity
Yes
Yes
*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.