- 16 DIMMs
- Dual Socket
- 2 TB Max
PowerEdge M640
Dell/Alienware - PowerEdge M640
Spec-true kits—mapped to Intel Xeon Scalable (2nd Gen) memory rules—so upgrades behave like OEM.
- Spec-Locked — Aligns Intel controller limits, system topology, and JEDEC timing
- Predictable Speeds — 1DPC up to 2933 MT/s; 2DPC typically 2666 MT/s
- Balanced from Slot 1 — Mirrored channel population across sockets for optimal bandwidth
- Enterprise Fulfillment — Lifetime warranty, advance replacement, expert support
- Sockets
- 2
- Max memory
- 2 TB1 TB LRDIMM · 2 TB RDIMM
- Memory tech
- DDR43200 MT/s · ECC
About
The Dell EMC PowerEdge M640 is a half-height blade server module engineered for dense, scalable compute in modular enclosures. Powered by 2× Intel Xeon Scalable (2nd Gen) processors supporting up to 28 cores per processor, this platform delivers 6 memory channels per CPU and 16 DIMM slots to achieve a maximum capacity of 2TB using 128GB LRDIMMs.
Built for the PowerEdge VRTX enclosure, the M640 combines enterprise-grade reliability with flexible expansion options, making it ideal for virtualization clusters, database consolidation, and high-density computing environments.
Why it matters: Proven Match™ converts controller rules and system topology into deterministic kits that install cleanly, train at the correct frequency, and avoid unsupported mixes.
Specs & Limits
| Specification | Detail |
|---|---|
| CPU Sockets | 2 × Intel Xeon Scalable (2nd Gen) — up to 28 cores per processor |
| Channels per CPU | 6 |
| DIMM Slots | 16 total (up to 2 DIMM(s)/channel) |
| Memory Type | DDR4 RDIMM/LRDIMM ECC |
| Controller Speeds | 1DPC up to 2933 MT/s; 2DPC typically 2666 MT/s |
| Max Capacity | 2TB with 128GB LRDIMMs (dual processor) |
| RDIMM Max | 1TB with 64GB modules (dual processor) |
| Last Reviewed | 2026-02-12 |
Memory Configuration Options
The M640 supports both RDIMM and LRDIMM memory types with octa-rank, quad-rank, dual-rank, and single-rank options.
| DIMM Type | Rank | Capacity | Single CPU Max | Dual CPU Max |
|---|---|---|---|---|
| LRDIMM | Octa | 128GB | 1024GB | 2048GB |
| LRDIMM | Quad | 64GB | 512GB | 1024GB |
| RDIMM | Dual | 64GB | 512GB | 1024GB |
| RDIMM | Dual | 32GB | 256GB | 512GB |
| RDIMM | Dual | 16GB | 128GB | 256GB |
| RDIMM | Single | 8GB | 64GB | 128GB |
Speed behavior: The CPU sets real memory bus speed. At 1 DIMM per channel (1DPC), platforms commonly reach up to 2933 MT/s. At 2 DIMMs per channel (2DPC), many controllers step to 2666 MT/s for stability. Listings reflect configured speed—not just the DIMM label.
Bank Schema (Population Map)
- Fastest (1DPC): Populate one DIMM per channel across both CPUs for maximum speed
- Balanced (2DPC): Add second DIMM per channel mirrored across CPUs for capacity/speed balance
- Maximum: Fill all 16 slots symmetrically for maximum capacity
Proven Match™ surfaces only controller-safe, topology-compliant configurations.
Compatible Memory Types
- Curated Samsung / Micron / Hynix modules for DDR4 RDIMM/LRDIMM ECC
- Zero-mix policy: No mixing RDIMMs with LRDIMMs; densities matched per channel
- Unsupported combinations never appear in the catalog
Configuration Rules:
- No RDIMM/LRDIMM mixing
- Symmetric densities per channel
- ECC required for server workloads
Validation Tokens
Every configuration must satisfy three gates before it appears here:
- JEDEC DDR4 compliance
- Intel Xeon Scalable (2nd Gen) controller rules (1DPC/2DPC)
- OEM slot topology verification
Only builds passing all three are surfaced—stable, balanced, and performance-true.
Workloads by Memory Tier
Mid Tier (256GB–512GB)
- Virtualization — Increase VM density in blade enclosures
- Databases / OLTP — Support transactional workloads with fast memory access
- Application Servers — Scale Java, .NET, and containerized applications
- Streaming ETL — Process data pipelines with adequate buffer space
Max Tier (1TB–2TB)
- In-Memory Analytics — Run Spark, Arrow, and real-time analytics engines
- AI/ML Fine-Tuning — Support model training and inference workloads
- ERP Consolidation — Host SAP HANA and Oracle in dense configurations
- VDI at Scale — Maximize virtual desktop density per blade
The M640 supports up to two 2.5-inch hot-swappable SAS/SATA drives, SSDs, or PCIe NVMe drives for local storage flexibility.
Upgrades are tied to outcomes—capacity and bandwidth scale predictably without instability.
PowerEdge M640 memory questions
The questions our engineers answer on the phone every day.
Shop Compatible Memory Kits
Pick your target: Fastest (1DPC) or Largest (2DPC/Max).
Every kit shows real-world speed and carries the Proven Match™ stamp—guaranteed compatible with your Dell EMC PowerEdge M640 blade server.
What's Included:
- Lifetime warranty on all memory modules
- Advance replacement for failed components
- Server-savvy support from memory experts who understand blade infrastructure
Configure your M640 with confidence—Proven Match™ ensures your upgrade works the first time.