Quick Specs Form Factor: 1U rack server Processor | Max: 28 Cores 2 x 2nd Gen Intel Xeon Scalable Memory | Max: 3TB 24x ECC DDR4 RDIMM/LRDIMM 2933Mhz NV Memory | Max: 192GB Supports up to 12 NVDIMM Pmem Memory | Max: 6.14TB Supports up to 12 Intel Optane NIC/LOM: 4 x 1GbE 2 x 10GbE + 2 x 1GbE4 x 10GbE2 x 25GbE Storage | Max: 76.8TB 4x 3.5" SAS/NL-SAS/SATA (HDD/SSD)8x 2.5" SAS/NL-SAS/SATA (HDD/SSD)10x 2.5" SAS/NL-SAS/SATA (HDD/SSD) NVMe + (Optional Rear Drives) Rear Drives | Max: 15.36TB 2x 2.5" SAS/SATA (HDD/SSD) NVMe RAID Controller: S140-SATA, NVMe (SW RAID) SATA, NVMeH330, HBA330, HBA350i, H730P, H740P, H750H840, HBA355e, 12 Gbps SAS HBA PCIe Slots: 3x PCIe 3.0 plus a dedicated PERC and rNDC slot GPU: Up to 3 single-width GPU (NVIDIA T4) or up to 1 FPGA Boot Options: BOSS-S1IDSDM w/ vFlash Remote Management: iDRAC9 with Lifecycle Controller Other Versions Dell PowerEdge R610 Dell PowerEdge R620 Dell PowerEdge R630 Dell PowerEdge R640 Dell PowerEdge R6415 Dell PowerEdge R650 Dell PowerEdge R650XS Dell PowerEdge R6515 Dell PowerEdge R6525 Dell PowerEdge R660 Dell PowerEdge R660XS Dell PowerEdge R6615 Dell PowerEdge R6625 Ideal for: Cloud Servers High-Performance Computing (HPC) Virtualization Memory Options The Dell PowerEdge R640 supports up to 24 DIMMs, with memory speeds reaching up to 2933 MT/s at 1 DIMM per channel or 2666 MT/s at 2 DIMMs per channel, depending on the 2nd Generation Intel® Xeon Scalable processor installed. Flexible configurations range from 8GB minimum up to 7.68TB maximum capacity. With 12 memory DIMM slots per CPU spread across 6 channels at 2 DIMMs per channel, best performance comes from evenly populating each CPU's channels — either 6 or 12 DIMMs total. There are 4 different types of DIMMs: RDIMM Registered DIMMs (RDIMMs) stand out as the most commonly used DIMM type, offering higher-capacity options, advanced RAS features, and a solid mix of frequency, capacity, and rank structure choices. LRDIMM LRDIMMs push memory capacity beyond RDIMM limits at the cost of higher power draw, using a buffer to reduce loading to a single load across all DDR signals for greater density. DCPMM DCPMM — also known as Intel Optane DC persistent memory — delivers large memory capacity at an affordable price point, used alongside RDIMMs or LRDIMMs with up to 6 modules supported per CPU, and requiring no battery for its persistent memory function. NVDIMM NVDIMMs combine NAND and DRAM to offer a persistent memory solution that survives power loss, system crashes, or normal shutdowns, relying on a battery for AC loss conditions, and can be paired with RDIMMs. Network Daughter Card (NDC) I/O on the Dell PowerEdge R640 stays balanced and scalable through integrated PCIe 3.0 expansion slots, while Dell EMC Network Daughter Cards let businesses select the right network fabric — speed, technology, vendor, and features like switch-independent partitioning for shared bandwidth management on 10GbE connections — without sacrificing a PCIe slot. Supported Options 4 x 1GbE 2 x 10GbE + 2 x 1GbE 4 x 10GbE 2 x 25GbE Expansion Riser Configurations The PowerEdge R640 system board reserves one x8 PCIe Gen3 slot for the storage controller card and another x8 PCIe Gen3 slot dedicated to the NDC, alongside its full riser lineup. Riser 1A Butterfly Riser Riser 1B Right Riser Low-Profile Riser 2A Left Riser Low-Profile Riser 2B Left Riser Full Height Expansion card riser PCIe slots on the riser Height Length Link Riser 1A (Butterfly Riser) Slot 2 Low Profile Half Length x16 Slot 1 Low Profile Half Length x16 Riser 1BRight Riser LP Slot 1 Low Profile Half Length x16 Riser 2ALeft Riser LP Slot 3 Low Profile Half Length x16 Riser 2BLeft Riser FH Slot 2 Low Profile Half Length x16 Storage Controllers A dedicated Mini-PERC slot sits on the Dell PowerEdge R640's system board, with additional PERC adapter card support available through any riser option — or the default system ports running SW RAID S140 can be used instead. Performance level Controller and description Entry ● S140-SATA, NVMe● (SW RAID) SATA, NVMe Value ● HBA330i Internal● H330e External, 12 Gbps SAS HBA-External Value Performance H730P Premium Performance H740P, H840P Boot Options Non-virtualized OS deployments call for BOSS, while virtualized environments are better served by the IDSDM. IDSDM or vFlash card This system's IDSDM with vFlash module occupies a dedicated slot at the rear of the chassis, using a Dell EMC-proprietary PCIe x1 slot over USB 3.0. On the PowerEdge R640, card format shifts from SD to microSD — IDSDM supports 16GB, 32GB, or 64GB, vFlash is fixed at 16GB, and a write-protect switch is built directly onto the module. Boot Optimized Storage Subsystem (BOSS) Providing a fast, dedicated location for OS installation, BOSS keeps drive-based storage free for data rather than the operating system. This RAID solution card supports up to two 6Gbps M.2 SATA drives via an x8 connector over PCIe Gen2 x2 lanes, offered exclusively in low-profile, half-height form factor. The Dell PowerEdge R640 Server - Power Supply Units (PSU) PSU 495 W AC 750 W AC 750 W AC 750 W Mixed Mode AC 1100 W AC 1600 W AC Class Platinum Platinum Titanium Titanium Platinum Platinum Heat dissipation —maximum 1908 BTU/hr 2891 BTU/hr 2843 BTU/hr 2902 BTU/hr 4100 BTU/hr 6000 BTU/hr Frequency 50/60 Hz Voltage 100–240 V AC, autoranging 100–240 V AC, autoranging 200–240 V AC, autoranging 100–240 V AC, autoranging 100–240 V AC, autoranging 100–240 V AC, autoranging Current 6.5 A – 3 A 10 A – 5 A 5 A 10 A – 5 A 12 A – 6.5 A 10 A
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