The Dell PowerEdge R250 4-Bay 3.5" Cabled is the mid configuration of Dell's 15th-generation entry single-socket platform. It pairs a single Intel Xeon E-2300 (Rocket Lake) processor with four 3.5" cabled LFF drive bays in a 1U chassis. What the four bays buy over the two-bay chassis is real parity RAID and more spindles for local capacity; what the cabled backplane saves over the hot-swap chassis is cost. The trade is serviceability: the bays are fixed-cabled rather than hot-plug, so replacing a failed drive means a planned maintenance window and a shutdown, even though a parity array keeps serving data while it is degraded.

This is a 15th-gen platform, and we sell it as Surplus New or Refurbished rather than factory-new. Surplus New means a genuinely unused unit drawn from excess channel inventory: never deployed, but outside Dell's current new-sales channel, which is why it is priced below Dell-direct new. Refurbished units are previously deployed servers we have tested and reconditioned. Both carry the Wholesale Servers warranty described below; tell us which condition you need at quote time and we price accordingly.

To spec a build, call 1-800-778-1545 and a technician will size the configuration with you: CPU, memory, drives, controller, and boot device. Every server we ship is bench-tested through a 12+ hour burn-in and backed by our 180-day warranty, and volume pricing is available once an order reaches 5 units. We quote configurations rather than fixed SKUs, so the hardware is sized to the workload instead of the other way around.

When 4 Cabled Bays Is the Right Choice

The R250 line has three chassis configurations on one platform. The R250 2-Bay 3.5" Cabled is the appliance option, two drives in a mirror and nothing more. This 4-Bay Cabled doubles the bay count, which is the threshold where parity RAID becomes possible: four drives is enough for RAID 5, RAID 6, or RAID 10, so the chassis can carry a protected data set with usable capacity rather than just a mirror. The R250 4-Bay 3.5" Hot-Swap has the same four bays on a hot-plug backplane, so a failed drive is replaced with the server still running.

Choose the 4-Bay Cabled when the workload needs four drives and parity protection but can tolerate a maintenance window for the occasional drive swap, and when shaving the cost of the hot-plug backplane matters. A parity array on this chassis survives a drive failure and keeps running degraded, which is the point of parity; what it does not give you is a live replacement, because pulling and reseating a cabled drive means scheduled downtime. If a drive failure has to be handled without taking the server offline, the 4-Bay Hot-Swap is the configuration to quote; if redundant power or a third PCIe slot is also on the list, the same-generation R350 4-Bay 3.5" is the step up.

Storage - 4 Cabled 3.5" Bays

The chassis carries four 3.5" cabled (non-hot-swap) LFF bays on a SAS/SATA backplane. Four drives open up the full set of practical RAID levels: RAID 10 (two usable drives, mirrored pairs, fast rebuilds), RAID 5 (three usable, single parity), or RAID 6 (two usable, dual parity). With 20 TB nearline SAS or SATA members the raw front-bay capacity reaches roughly 80 TB; usable capacity depends on the RAID level, landing near 60 TB in RAID 5 or 40 TB in RAID 6 or RAID 10. There is no NVMe on this backplane; the R250 front bays are SAS/SATA only, and flash performance comes from SATA or SAS SSDs in these bays, not from U.2.

A word on RAID level for spinning disks at this capacity: RAID 5 is workable on four small-to-mid drives, but on large 16 TB to 20 TB members the rebuild window after a failure is long enough that a second failure during rebuild becomes a real risk, so we steer capacity-and-resilience buyers toward RAID 6 or RAID 10, or toward fewer, larger drives behind a mirror. We size the RAID level to the drive capacity and the workload at quote time rather than defaulting to RAID 5.

For boot, the right device is the BOSS-S1 card: two M.2 SATA SSDs in a hardware RAID 1 mirror on a dedicated card. It keeps the operating system off the four front bays, so all four LFF bays stay available for the data array, and it provides mirrored boot redundancy without consuming a drive slot. Note the R250 uses the BOSS-S1 specifically; the rear hot-plug BOSS-S2 belongs to the R350, not this chassis. IDSDM (dual microSD) and an internal USB 3.0 port are also available for hypervisor or recovery media.

Storage Controllers

The R250 supports the entry PERC 11 controller family plus software RAID. On a four-bay build the controller choice is load-bearing, because it decides whether parity RAID is even available:

• S150: chipset software RAID. Adequate for a boot mirror or a light, non-production array. No cache, parity is host-driven; not a production data-array recommendation.
• PERC H355: hardware RAID, no cache. It does RAID 0, 1, and 10 only - like the H345 and H350, it does not do RAID 5, 6, 50, or 60. On this four-bay chassis the H355 tops out at RAID 10, which is a valid and fast choice, but if the requirement is parity RAID the H355 cannot deliver it.
• PERC H755: hardware RAID with battery-backed cache. This is the controller to quote when the four-bay array needs RAID 5 or RAID 6, or when parity write performance matters. On the R250, parity RAID means the H755; there is no other path to RAID 5/6 on this platform.
• HBA355i / HBA355e: pass-through HBA, internal and external, for software-defined storage or a host that wants raw disk access.

What the R250 does not take is the older PERC 9/10 line: no H730, no H740P. Those are 13th and 14th-gen Mini-PERC parts, and the 15th-gen entry board does not carry them forward. A quote asking for an H740P on an R250 is an assumption carried over from an older platform; the correct 15th-gen equivalents are the H355 (RAID 10 and below) and the H755 (parity RAID).

Processors

The R250 is a single-socket Rocket Lake platform on socket LGA 1200 with the Intel C252 chipset. It takes one Intel Xeon E-2300 processor, up to eight cores and sixteen threads, in roughly the 95W class. SKUs run from the lower-power E-2314 and E-2334 up to the 8-core E-2378 and E-2388G; Pentium options exist for the lightest roles but give up cores, cache, and turbo headroom. On a four-bay box doing real storage work, the 6-core E-2336 or 8-core E-2378 is the sensible center of the range: enough threads to drive a parity array, a file or backup server, a small database, or a handful of light virtual machines, without paying for cores the platform cannot otherwise use.

One platform fact worth stating plainly, because it surprises buyers: the integrated graphics on the Xeon E-2300 are disabled on Dell servers. Console video comes from the Matrox G200 in iDRAC9, not from the CPU iGPU. That has no effect on a headless server role, but the on-die graphics are not a usable display path here. This is Rocket Lake (Cypress Cove), the Xeon E-2300 generation. It is not Ice Lake-SP; Ice Lake-SP is the Xeon Scalable silicon in the R650 and R750, a different socket and a different platform entirely.

Memory

The R250 has four DDR4 UDIMM slots across two memory channels, two DIMMs per channel. Memory is unbuffered ECC only: no RDIMM, no LRDIMM, and no persistent memory. Maximum capacity is 128 GB using four 32 GB unbuffered ECC modules. Rated speed reaches DDR4-3200 on the Xeon E-2300 SKUs; a Pentium caps lower at 2666, and a fully populated dual-rank, two-DIMM-per-channel configuration steps to 2933 under Intel's population rules.

Older catalog copy understated this, so it is worth correcting directly: the R250 is not a 2-slot, 64 GB machine. It is a 4-slot, 128 GB machine, and that ceiling holds across every R250 chassis including this 4-Bay Cabled. For a four-drive file, backup, or light-virtualization role 128 GB of unbuffered ECC is comfortable headroom, but it is still an entry ceiling. A buyer who can already see a path past 128 GB of memory should not buy into this socket; the dual-socket R450 with registered DIMMs is the platform that scales.

Networking and PCIe Expansion

Onboard networking is a Broadcom 5720 dual-port 1 GbE LOM plus a dedicated iDRAC management port. There is no Network Daughter Card or OCP mezzanine on this platform and no onboard 10 GbE: the R250 networks at 1 GbE on the motherboard. If a workload needs 10 GbE or 25 GbE, that is an add-in card in one of the PCIe slots, and the slot budget is tight, so plan for it up front.

PCIe on the R250 is two PCIe Gen4 slots, both low-profile and half-length: one x8 in an x16 mechanical connector and one x8 in an x8 connector. That is the entire expansion budget, and on a four-bay parity build it is usually spent: one slot for the H755 RAID controller that makes parity RAID possible, leaving one slot for a faster NIC or an external SAS HBA. If the build needs the RAID card plus a 10 GbE NIC plus anything else, the two-slot ceiling is the wall, and the same-generation R350, with a third Gen4 slot and a dedicated PERC position, is the configuration that fits.

GPU Support

The R250 is not a GPU platform, and we do not pretend otherwise. The 1U thermal envelope, the single-socket power and lane budget, and the two low-profile PCIe slots leave no practical room for a compute accelerator; there is no x16 slot at the power and cooling a datacenter GPU needs, and on a four-bay build the slots are already spoken for by storage and networking. If a buyer lands here looking for GPU compute, inference, or transcode, this is the wrong box. For GPU-capable Dell hardware, look at the 2U PowerEdge R750, which has the slots, power, and cooling for double-width accelerators.

Management - iDRAC9 Generation

The R250 runs iDRAC9 with Lifecycle Controller, the same out-of-band management generation as the rest of Dell's 15th-gen line. iDRAC9 is licensed as Express, Enterprise, or Datacenter. Express covers basic remote monitoring and IPMI; for production you generally want Enterprise, which adds the full virtual console, virtual media, and the System Lockdown feature that prevents unplanned firmware and configuration drift. Datacenter adds telemetry features that matter more in dense fleets than on a single entry server.

On the security side the R250 carries Dell's silicon Root of Trust, Secure Boot, and cryptographically signed firmware, with an optional TPM 2.0 module for measured boot and compliance frameworks. On a cabled four-bay box, iDRAC9 Enterprise is doubly useful: drive service already requires a planned visit, so being able to reboot, reinstall, and recover the server remotely keeps every other kind of incident from also becoming a site visit.

Power and Cooling

This is where the entry positioning shows most clearly. The R250 takes a single, non-redundant power supply. Tiers run 450W Bronze, 450W Platinum, and 700W Titanium in AC and DC variants; the exact tier is confirmed per SKU at quote time, and for a single-CPU four-drive build a 450W supply is typically sufficient. What the R250 does not offer is PSU redundancy: there is no second hot-plug supply. If the workload cannot tolerate a power-supply failure taking the server offline, the R250 is not the right chassis, and the R350, with dual hot-plug redundant supplies, is the platform to quote.

Cooling is sized for the single-socket E-2300 envelope. The 95W-class processors here do not require the high-performance heatsinks that the higher-TDP Xeon Scalable platforms need, and there are no exotic thermal constraints to plan around at this tier; standard data-closet and small-rack ambient conditions are well within range.

Physical Specs & Platform Notes

• Form factor: 1U rack, approximately 558.9 mm deep, regulatory model E79S. Fits standard-depth racks and most short-depth cabinets.
• PCIe expansion: two PCIe Gen4 slots, both low-profile half-length (one x8-in-x16, one x8-in-x8). On a parity build budget one for the H755 and one for a NIC.
• Parts availability: strong. The R250 is a current 15th-gen platform; drives, power supplies, DDR4 UDIMMs, PERC 11 controllers, and BOSS-S1 cards are all readily sourced, and Dell platform support for 15th gen is active.
• Accessories we recommend: a BOSS-S1 boot card so the OS stays off the four front bays; the H755 controller if the array needs parity RAID; a ReadyRails sliding rail kit for the 1U chassis; and any 10 GbE NIC specified at order time so the two-slot budget is planned rather than discovered.
• Platform notes: cabled (non-hot-swap) drive bays, so drive service needs a maintenance window even on a parity array; no NVMe on the front backplane; no PSU redundancy; CPU integrated graphics disabled with video via the iDRAC9 Matrox G200; BOSS-S1 rather than BOSS-S2 on this chassis.

Our Assessment

Where it excels: The R250 4-Bay Cabled is the right answer for a small-business or branch-office server that needs four drives and a parity-protected data set but does not need live drive replacement and wants to spend less than the hot-swap chassis costs. A file server with a RAID 6 volume, a backup or Veeam repository target, a small database with its data on a protected array, or a light virtualization host with local storage all fit comfortably inside its envelope. Paired with the H755 it carries real RAID 5 or RAID 6 capacity at the lowest cost in the four-bay R250 range.

Where to look instead: If a failed drive has to be swapped without downtime, the R250 4-Bay 3.5" Hot-Swap is the production-serviceable configuration. If two drives in a mirror is genuinely all the role needs, the lower-cost R250 2-Bay 3.5" Cabled covers it. If the deployment needs redundant power or a third PCIe slot, step up to the R350 4-Bay 3.5"; if it needs more than 128 GB of memory or more than eight cores, the dual-socket R450 is the platform. GPU work belongs on the R750.

Bottom line: This is the value four-bay R250. An organization that wants four drives and parity protection in a single inexpensive 1U server, and that can schedule the rare drive swap rather than paying for a hot-plug backplane, gets exactly that here. The typical buyer is an IT generalist or a managed-service provider standing up a branch or small-office storage-and-application server where a protected array matters but non-stop drive serviceability does not justify the hot-swap premium.

Honest Limitations

• Cabled bays, not hot-plug. A parity array survives a drive failure, but replacing the failed member and rebuilding requires a maintenance window and a shutdown. The hot-swap chassis is the no-downtime answer.
• Single socket, eight cores, 128 GB. A hard ceiling: no second CPU, no path past four DIMM slots, and no registered memory. Size for it or buy a higher tier.
• No PSU redundancy. One power supply, non-redundant. A power-supply failure takes the server offline. The R350 is the redundant-power answer.
• No NVMe. The front backplane is SAS/SATA only.
• Parity RAID requires the H755. The entry H355 is RAID 0/1/10 only; RAID 5 or 6 needs the H755 controller.
• Two PCIe slots, both low-profile. The RAID controller plus one NIC effectively fills the chassis.
• Not a GPU platform. No accelerator path; see GPU Support above.

Workload Fit

Where to Look Instead

• Same four bays, hot-plug service: R250 4-Bay 3.5" Hot-Swap, drive replacement without downtime.
• Lower cost, two drives: R250 2-Bay 3.5" Cabled, the appliance-tier R250 for a mirror.
• Same generation, more headroom: R350 4-Bay 3.5", with redundant power, a third PCIe slot, and rear hot-plug boot media.
• Up a tier for memory and cores: R450 4-Bay 3.5", dual-socket Xeon Scalable with registered memory beyond the entry ceiling.
• Previous generation: R240 4-Bay 3.5", the 14th-gen entry predecessor on the Xeon E-2100 and E-2200.

Ready to Configure?

Tell us the workload, the drive type and capacity, the RAID level, the memory target, and the quantity, and we will build a configuration around it. Call 1-800-778-1545 to spec the CPU, memory, drives, controller, and BOSS-S1 boot card with a technician who knows the platform. Every R250 ships after a 12+ hour burn-in and a full inspection, carries our 180-day warranty, and is available at volume pricing from 5 units. We quote configurations rather than fixed bundles; request a quote and we return formal pricing, typically within one business day.