Dell PowerEdge R660xs

Name: Dell PowerEdge R660xs
Brand: Dell

CurrentServers1U rack

The Dell PowerEdge R660xs is an enterprise 1U rack server powered by 2 Intel Xeon Scalable 4th and 5th Gen (up to 32 cores, max 250W TDP) and 16 memory slots supporting up to 1024GB DDR5-4800 / DDR5-5600 RDIMM. Configured with Up to 8x 2.5-inch SAS/SATA, 10x 2.5-inch NVMe, or 4x 3.5-inch drives and Up to 3 PCIe Gen4/Gen5 slots, the R660xs delivers balanced compute and I/O density for enterprise database, hypervisor, and application workloads.

Also written as: PowerEdge R660xs, Dell R660xs

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Specifications

Brand	Dell
Family	PowerEdge R
Form factor	1U rack
Released	Mar 2023
Cpu sockets	2
Cpu platform	Intel Xeon Scalable 4th and 5th Gen (up to 32 cores, max 250W TDP)
Memory slots	16
Memory type	DDR5-4800 / DDR5-5600 RDIMM
Memory max (GB)	1,024
Drive bays	Up to 8x 2.5-inch SAS/SATA, 10x 2.5-inch NVMe, or 4x 3.5-inch drives
Pcie slots	Up to 3 PCIe Gen4/Gen5 slots
Gpu support	None supported
Network onboard	OCP 3.0 mezzanine slot; 1x 1GbE iDRAC port
Power supply	Dual redundant hot-plug 600W, 700W, 800W, 1100W or 1400W

Generations

Previous generation: Dell PowerEdge R650xs

About the R660xs

The Dell PowerEdge R660xs is an enterprise 1U rack server engineered for computing and virtualization workloads. Powered by 2 Intel Xeon Scalable 4th and 5th Gen (up to 32 cores, max 250W TDP) across 16 memory slots supporting up to 1024GB DDR5-4800 / DDR5-5600 RDIMM, the R660xs balances throughput and memory capacity. In Dell's server catalog, the R660xs succeeded the POWEREDGE-R650XS, positioned alongside rival systems including PROLIANT-DL360-GEN11.

Options and compatibility

Processor support on the R660xs utilizes 2 LGA4677 (Socket E) sockets with thermal heatsinks matching CPU power envelopes. System memory slots on the R660xs require DDR5-4800 / DDR5-5600 RDIMM modules, and mixing RDIMM with LRDIMM memory is not supported. Front backplanes on the R660xs accommodate either DXD9H (2.5-inch SFF) and E3.S carriers or X7K8W (3.5-inch LFF) trays based on chassis option. Networking on the R660xs uses OCP 3.0 mezzanine adapter, and expansion cards install into Up to 3 PCIe Gen4/Gen5 slots risers.

How to identify it

Physical identification of the R660xs is verified by the 16th-generation dark slate honeycomb front bezel with the R660xs badge on the front chassis ear. The pull-out information tag on the R660xs control panel displays the 7-character Dell Service Tag and default login credentials. In iDRAC9 Gen16, the server identifies as R660xs with active firmware, slot mapping, and power telemetry.

Buying used

When evaluating a pre-owned R660xs, inspect the LGA4677 (Socket E) CPU socket pins for damage and ensure retention clips are intact. Run Dell ePSA diagnostics across all 16 memory slots of the R660xs to verify zero uncorrectable ECC faults under load. Verify that redundant power supplies in the R660xs match in wattage and that iDRAC9 Gen16 Enterprise remote console is enabled. Ensure required R660xs drive caddies and bracket accessories are present.

Compatible parts

Bezels

325-BCHH Dell PowerEdge 1U Standard LCD Front Bezel with Key Lock

Rail kits

770-BBBQ Dell ReadyRails II Sliding Rails for 1U PowerEdge Servers (A7/A8)

RAID controllers

PERC-H755 Dell PERC H755 Front SAS 12Gb/s 8GB NV Cache PCIe Gen4 RAID Controller

Boot devices

BOSS-S2 Dell Boot Optimized Storage Solution (BOSS-S2) Hot-Plug Rear Controller with Dual M.2 SSDs

Works together

How the Dell PowerEdge R660xs connects to servers, storage and the network: 4 ways, with the parts and products on each path.

Fibre Channel SAN iSCSI and NVMe/TCP over Ethernet Direct-attached SAS File storage (NFS and SMB)

Fibre Channel SAN

Serverwith an FC HBAFC switchtwo fabrics, A and BStorage arrayFC host ports

Match the speed: 16Gb and 32Gb FC HBAs, switches and array ports work together, and each generation also runs one or two speeds below its own (a 32Gb port runs at 16Gb and 8Gb).

Adapters for the server (check the fit list)

540-BBUU Dell Emulex LPe31002 Dual Port 16Gb Fibre Channel Host Bus Adapter
540-BBUV Dell QLogic 2692 Dual Port 16Gb Fibre Channel Host Bus Adapter
540-BCMS Dell QLogic 2770 Single Port 32Gb Fibre Channel PCIe Adapter
540-BCMT Dell QLogic 2772 Dual Port 32Gb Fibre Channel PCIe Adapter

Switches

Storage

Optics

407-BBOG Dell 16Gb Short Wave SFP+ Fibre Channel Optical Transceiver
407-BCBI Dell 32Gb Short Wave SFP28 Fibre Channel Optical Transceiver
407-BBOH Dell 8Gb Short Wave SFP+ Fibre Channel Optical Transceiver

Fibre Channel SAN: how it fits together

iSCSI and NVMe/TCP over Ethernet

Server10/25/100GbE NICEthernet switchstorage VLAN, two switchesStorage arrayiSCSI or NVMe/TCP ports

Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.

Adapters for the server (check the fit list)

540-BBHG Dell Intel X520/I350 2x10GbE SFP+ + 2x1GbE BASE-T Network Daughter Card (rNDC)
540-BBHH Dell Intel X540/I350 2x10GBASE-T + 2x1GbE BASE-T Network Daughter Card (rNDC)
540-BBIU Dell Broadcom 57416/5720 2x10GBASE-T + 2x1GbE Network Daughter Card (rNDC)
540-BBIV Dell Broadcom 57412/5720 2x10GbE SFP+ + 2x1GbE Network Daughter Card (rNDC)

iSCSI and NVMe/TCP over Ethernet: how it fits together

Direct-attached SAS

Serverexternal SAS HBASAS cableMini-SAS HD, no switchArray or JBODSAS host ports or EMM

12Gb SAS uses Mini-SAS HD (SFF-8644) connectors; older 6Gb gear uses Mini-SAS (SFF-8088). Adapter cables exist, but the link runs at the slower speed.

Adapters for the server (check the fit list)

405-AANT Dell 12Gbps SAS HBA Dual Port External PCIe Controller
405-AASU Dell HBA355e External SAS 12Gb/s Host Bus Adapter

Storage

Direct-attached SAS: how it fits together

File storage (NFS and SMB)

Server or clientEthernet NICEthernet switchdata or storage VLANNAS or scale-outNFS, SMB, S3 ports

Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.

Adapters for the server (check the fit list)

540-BBHG Dell Intel X520/I350 2x10GbE SFP+ + 2x1GbE BASE-T Network Daughter Card (rNDC)
540-BBHH Dell Intel X540/I350 2x10GBASE-T + 2x1GbE BASE-T Network Daughter Card (rNDC)
540-BBIU Dell Broadcom 57416/5720 2x10GBASE-T + 2x1GbE Network Daughter Card (rNDC)
540-BBIV Dell Broadcom 57412/5720 2x10GbE SFP+ + 2x1GbE Network Daughter Card (rNDC)

Storage

File storage (NFS and SMB): how it fits together

Plan and size it

Draw this setup in the topology planner mrplanb.com
Add up rack power and space rack-density.com
Virtualization storage Ledger: scored storage platforms mrplanb.com
SAN transport and NVMe over FC for backup mrplanb.com
Dell E-Lab Navigator (Dell interoperability) dell.com

Equivalent models from other brands

HPE ProLiant DL360 Gen11 · compare

FAQ

How does the R660xs differ from the R660?

The R660xs has 16 DDR5 DIMM slots and supports CPUs up to 32 cores (250W TDP), whereas the R660 has 32 DIMMs and supports top-bin 350W CPUs.

What drive options are available on the R660xs?

Configurations include 8x 2.5-inch SAS/SATA, 10x 2.5-inch NVMe, or 4x 3.5-inch SAS/SATA drive bays.

Buying or selling R660xs?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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Sources

Dell PowerEdge R660xs Spec Sheet, checked 2026-10-27