Dell Server Memory — PowerEdge RAM Upgrade Guide for Every Generation
Find the right Dell PowerEdge server memory. DDR3 vs DDR4 vs DDR5, ECC RDIMM vs LRDIMM, max capacity charts, and compatible part numbers for R720 through R760.
Dell PowerEdge Server Memory — The Complete Guide
Memory upgrades are the fastest way to boost Dell PowerEdge server performance. Whether you are running VMware ESXi, Hyper-V, Proxmox, or Windows Server, more RAM means more virtual machines, larger database caches, and better application responsiveness.
Dell uses industry-standard ECC Registered DIMMs (RDIMMs) and Load-Reduced DIMMs (LRDIMMs). You do not need to buy Dell-branded memory — any major manufacturer module (Samsung, Hynix, Micron) with the correct specs works perfectly.
Dell PowerEdge Memory Compatibility
| Server | Generation | Memory Type | Max Speed | DIMM Slots | Max RAM |
|---|---|---|---|---|---|
| R760 | 16th Gen | DDR5 RDIMM | 4800MHz | 32 | 2TB |
| R750 | 15th Gen | DDR4 RDIMM/LRDIMM | 3200MHz | 32 | 2TB |
| R740 | 14th Gen | DDR4 RDIMM/LRDIMM | 2666MHz | 24 | 1.5TB |
| R730 | 13th Gen | DDR4 RDIMM/LRDIMM | 2400MHz | 24 | 1.5TB |
| R720 | 12th Gen | DDR3 RDIMM/LRDIMM | 1866MHz | 24 | 768GB |
| R630 | 13th Gen | DDR4 RDIMM/LRDIMM | 2400MHz | 24 | 1.5TB |
| R620 | 12th Gen | DDR3 RDIMM/LRDIMM | 1866MHz | 24 | 768GB |
| T640 | 14th Gen | DDR4 RDIMM/LRDIMM | 2666MHz | 24 | 1.5TB |
| T630 | 13th Gen | DDR4 RDIMM/LRDIMM | 2400MHz | 24 | 1.5TB |
Most Popular Dell Server Memory Part Numbers
DDR4 (R730, R740, R750)
| Dell Part Number | Capacity | Speed | Type |
|---|---|---|---|
| SNP4JMGMC/16G | 16GB | 2666MHz | RDIMM |
| SNPTN78YC/32G | 32GB | 2666MHz | RDIMM |
| SNP75X1VC/32G | 32GB | 2400MHz | RDIMM |
| SNPP2MYXC/64G | 64GB | 2933MHz | LRDIMM |
| A9781929 | 32GB | 2666MHz | RDIMM |
| A9654881 | 16GB | 2400MHz | RDIMM |
| 370-AEQF | 32GB | 2933MHz | RDIMM |
| 370-AESJ | 64GB | 2933MHz | RDIMM |
| AA810826 | 32GB | 3200MHz | RDIMM |
DDR3 (R720, R620)
| Dell Part Number | Capacity | Speed | Type |
|---|---|---|---|
| SNP20D6FC/16G | 16GB | 1600MHz | RDIMM |
| SNPJDF1MC/16G | 16GB | 1600MHz | RDIMM |
| SNP0R45JC/32G | 32GB | 1600MHz | LRDIMM |
| A6996789 | 16GB | 1600MHz | RDIMM |
| A7134886 | 8GB | 1600MHz | RDIMM |
Memory Population Guidelines
Dell PowerEdge servers require DIMMs to be installed in a specific order for optimal performance.
Key Rules:
- Always populate white slots before black, then green
- Balance memory evenly across both CPUs in dual-socket configurations
- Install DIMMs in matched sets for best performance (identical capacity, speed, and rank)
- Minimum: 1 DIMM per CPU (but at least 1 per channel recommended)
Optimal Configurations for R740/R730 (24 slots, 12 per CPU):
| DIMMs per CPU | Total DIMMs | Suggested | Bandwidth |
|---|---|---|---|
| 1 per channel (6) | 12 | 6x 16GB per CPU = 192GB | Full speed |
| 2 per channel (12) | 24 | 12x 16GB per CPU = 384GB | May downclock 1 bin |
| 1 per channel (6) | 12 | 6x 32GB per CPU = 384GB | Full speed |
Pro Tip: For the best balance of capacity and speed on an R740, use 12x 32GB RDIMMs (6 per CPU, 1 per channel). This gives you 384GB at full 2666MHz speed with room to double later.
Dell Server RAM Upgrade — Cost in 2026
| Module | New (Dell) | Refurbished | Savings |
|---|---|---|---|
| 16GB DDR4 2666MHz RDIMM | $85-120 | $15-25 | 75-80% |
| 32GB DDR4 2666MHz RDIMM | $150-220 | $30-50 | 75-80% |
| 64GB DDR4 2933MHz LRDIMM | $300-450 | $60-100 | 75-80% |
| 16GB DDR3 1600MHz RDIMM | Discontinued | $8-15 | N/A |
| 32GB DDR3 1600MHz LRDIMM | Discontinued | $15-25 | N/A |
Refurbished server memory offers dramatic savings — typically 75-80% below Dell list pricing for identical modules. Every module at Pro Disk Network is tested with MemTest86 and backed by our compatibility guarantee.
Pro Disk Network stocks over 8,000 Dell-compatible server memory modules across all generations. Same-day shipping, free delivery on orders over $150. Contact sales@prodisknetwork.com for bulk pricing on 10+ modules.