17 PowerEdge R420 Technical Guide
5 Memory
The large memory footprint of the Dell PowerEdge R420 offers greater capacities, higher
frequencies, and more flexibility. The R420 supports up to 384GB of memory (12 DIMM slots) and
speeds of up to 1600MT/s, providing high performance in a variety of applications. The new
reliability, availability, serviceability (RAS) features like memory mirroring and sparing help you
increase your uptime and reduce data loss. RAS aids in the rapid and accurate diagnosis of faults that
require service, increasing your memory reliability.
Supported memory
The R420 supports the memory technologies shown in Table 7.
Table 7. Memory technologies supported
Feature UDIMM RDIMM
Register No Yes
Buffer No No
Frequencies* 800, 1066, 1333 or 1600MT/s 800, 1066, 1333, or 1600MT/s
Ranks supported 1 or 2 1, 2, or 4
Capacity per DIMM 2 or 4GB 2, 4, 8, 16, or 32GB
Maximum DIMMs per channel 2 2
DRAM technology x8 x4 or x8
Temperature sensor Yes Yes
Error Correction Code (ECC) Yes Yes
Single Device Disable Code
(SDDC)
Yes (with advanced ECC mode) Yes
Address parity Yes Yes
*Although the R420 supports DIMM speeds of 800MT/s and 1066MT/s, you can only purchase this system
with DIMM speeds of 1333MT/s and 1600MT/s on Dell.com.
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