Dell PowerEdge R650/R750 Server Memory (RAM) Upgrade
- server-parts.eu server-parts.eu
- Jun 7
- 3 min read
Upgrading memory in Dell PowerEdge R650 and R750 servers helps improve performance, especially for tasks like virtualization, large databases, or high-performance computing.
Dell PowerEdge R650/R750 Server Memory (RAM) Modules: Save Up To 80%
✔️ No Upfront Payment Required - Test First, Pay Later!
These 15th generation servers are made for dense workloads and support advanced memory types such as DDR4 ECC, RDIMMs, LRDIMMs, and Intel Optane Persistent Memory 200 Series.
The Dell PowerEdge R650 and R750 server support the same memory types, sizes, and features, but the R750’s 2U chassis provides better airflow, making it more suitable for fully loaded memory configurations.
Supported Dell PowerEdge R650/R750 Server Memory Types and Specs
The R650 and R750 servers both support DDR4 ECC memory, which checks and corrects memory errors.
Memory types supported:
RDIMM (Registered DIMM): Up to 64 GB per module.
LRDIMM (Load-Reduced DIMM): Up to 256 GB per module.
Intel Optane Persistent Memory 200 Series (PMem): 128 GB, 256 GB, or 512 GB modules. Works in Memory Mode or App Direct Mode.
Other details:
Speed: Up to 3200 MT/s, depending on CPU and configuration.
Slots: 32 DIMM slots with 2 CPUs (8 memory channels per CPU, 2 DIMMs per channel).
Voltage: 1.2V for all supported DDR4 modules.
ECC support: Required for all memory.
Capacity limits:
RDIMMs: Up to 2 TB (32 x 64 GB).
LRDIMMs: Up to 8 TB (32 x 256 GB).
PMem: Up to 8 TB of PMem. Total capacity can reach about 12 TB when combined with DRAM (for example, 8 TB PMem + 4 TB DRAM).
Dell Part Numbers for Memory (RAM) Modules of Dell PowerEdge R650/R750 Server
Here are examples of Dell-certified memory part numbers:
16 GB DDR4 RDIMM (2Rx8, 3200 MT/s): AA783421
64 GB DDR4 RDIMM (2Rx4, 3200 MT/s): AA783423
128 GB DDR4 LRDIMM (4Rx4, 3200 MT/s): AB445285
256 GB DDR4 LRDIMM (8Rx4, 3200 MT/s): AC319857
128 GB Intel Optane PMem 200: AB614354
512 GB Intel Optane PMem 200: AB739782
Use Dell-certified parts to keep support and avoid issues.
Memory Setup Tips and Good Practices for Dell PowerEdge R650/R750 Server Ram Modules
Use the same memory type: Do not mix RDIMM and LRDIMM. Use either one type or Optane mixed with one type (RDIMM or LRDIMM).
Memory sizes: You can use up to two different capacities, but it’s better to use the same size for all modules.
Balance across channels: Spread memory evenly across channels. In dual CPU systems, both CPUs should have the same memory layout.
Slot order: Fill white-tabbed slots first. In dual CPU systems, fill A1–A8 and B1–B8 before using A9–A16 and B9–B16.
Use memory only where CPUs are installed: If only one CPU is present, use A# slots only.
BIOS and firmware: Update BIOS and iDRAC before installing new memory.
Handling memory: Power off the system, use anti-static tools, and insert DIMMs fully and evenly.
Intel Optane Memory (RAM) Module Setup for Dell PowerEdge R650/R750 Server
If you use Optane:
Choose Memory Mode (acts like DRAM) or App Direct Mode (software uses Optane directly).
Use the same mode on all PMem modules.
Aim for a DRAM to PMem ratio of 1:4 to 1:16.
Features for Dell PowerEdge R650/R750 Server Memory (RAM) Module Safety
Optional features:
Memory Mirroring: Uses half the memory for backup. Slower but protects data.
Memory Sparing: Reserves memory to replace failing modules.
Optimizer Mode: Gives highest usable capacity (default mode).
Avoid These Common Mistakes: Dell PowerEdge R650/R750 Server Memory (RAM) Modules
Mixing RDIMM and LRDIMM
Skipping BIOS updates
Leaving gaps in channels (e.g., only 3 out of 4 DIMMs)
Using memory in a slot without a CPU
Powering on the server during memory changes
Dell PowerEdge R650/R750 Server Memory (RAM) Modules: Save Up To 80%
✔️ No Upfront Payment Required - Test First, Pay Later!
Comments