The Dell PowerEdge R350 4-Bay 3.5" is the production-grade configuration of Dell's 15th-generation entry single-socket platform. It pairs a single Intel Xeon E-2300 (Rocket Lake) processor with four hot-plug 3.5" LFF drive bays in a 1U chassis, and unlike the appliance-tier R250 it ships with dual hot-plug redundant power supplies, three PCIe slots, and a rear hot-plug boot card. That combination is what makes the R350 the entry server you put into a real production role: a small business or branch office gets enterprise management, redundant power, and serviceable hot-plug drives without stepping up to a dual-socket platform and its cost.

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 selling fixed SKUs, so the hardware is sized to the workload instead of a box you have to design around.

Where the R350 Fits in the Family

The R350 sits one step above the R250 in Dell's 15th-generation entry rack lineup, on the same single-socket Rocket Lake Xeon E-2300 platform but with the redundancy and expansion a production deployment expects. Where the R250 4-Bay 3.5" Hot-Swap gives you four hot-plug bays on a single non-redundant power supply and two PCIe slots, the R350 adds a second hot-plug power supply, a third PCIe slot with a dedicated controller position, and a rear hot-plug BOSS boot card. If the box matters enough to want redundant power and tool-free serviceability, the R350 is the right entry tier.

Inside the R350 line there are two chassis variants on identical platform internals. This 4-Bay 3.5" carries four large-format LFF bays for bulk local capacity; the R350 8-Bay 2.5" trades capacity per drive for spindle count and SFF SSD density. Above the R350 the single-socket ceiling is fixed at one CPU, eight cores, and four DIMM slots; when a workload needs more cores, more than 128 GB of memory, or registered DIMMs, the platform itself is the wrong tier and the dual-socket R450 4-Bay 3.5" on Xeon Scalable is the answer.

Storage - 4 Hot-Swap 3.5" Bays

The chassis carries four 3.5" hot-plug LFF bays on a SAS/SATA backplane. Because the backplane is hot-plug, a failed drive in a protected array is replaced and rebuilt with the server still serving its workload, no maintenance window required. 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. There is no NVMe on this backplane; the R350 front bays are SAS/SATA only, and flash performance comes from SATA or SAS SSDs in these bays, not from U.2.

A note 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. 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-S2 card: two M.2 SATA SSDs in a hardware RAID 1 mirror on a dedicated, rear-accessible hot-plug card. It keeps the operating system off the four front bays, so all four LFF bays stay available for the data array, and the rear hot-plug design means the boot media itself is serviceable without opening the chassis. Note the R350 uses the rear hot-plug BOSS-S2 specifically; the non-hot-plug BOSS-S1 is the R250 part. IDSDM (dual microSD) and an internal USB 3.0 port are also available for hypervisor or recovery media.

Storage Controllers

The R350 supports the entry PERC 11 controller family plus software RAID. The controller choice decides whether parity RAID is available, so it is worth getting right:

• 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, 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. The controller to quote when the array needs RAID 5 or RAID 6, or when parity write performance matters. On the R350, 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 R350 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 R350 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 R350 is a single-socket Rocket Lake platform on socket LGA 1200 with the Intel C256 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. For most R350 buyers the 6-core E-2336 or the 8-core E-2378 is the sensible center of the range: enough threads for a file server, a domain controller, a small database, a backup target, 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 R350 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. Some older catalog copy lists the R350 as taking UDIMM or RDIMM; that is wrong, the platform is unbuffered ECC only. 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.

The 128 GB ceiling is the single most important sizing fact on this platform. It is comfortable for a file server, a backup target, a directory or print server, or a small set of light virtual machines, but it is an entry ceiling and it does not move: there are four slots and no registered-memory path. A buyer who can already see a deployment growing past 128 GB of memory should not buy into this socket; the dual-socket R450 with sixteen registered DIMM slots 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 R350 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.

PCIe on the R350 is three PCIe Gen4 slots plus a dedicated controller position, all low-profile and half-length. This is a meaningful step over the R250's two slots: the dedicated PERC position means the H755 RAID controller does not consume a general-purpose slot, leaving the three Gen4 slots free for networking and expansion. In practice that is enough budget for a 10 GbE or 25 GbE NIC, an external SAS HBA, and one more card without running into the wall. For workloads that need more expansion than three slots, or a second socket behind them, the 2U R750xs 8-Bay 3.5" is the larger-chassis step in the same generation.

GPU Support

The R350 is not a GPU platform, and we do not pretend otherwise. The 1U thermal envelope, the single-socket power and lane budget, and the 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. 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 R350 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 R350 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. For a branch or small-office deployment the practical value of iDRAC9 Enterprise is being able to reboot, reinstall, and recover the server remotely without a site visit, which on a remote box often pays for the license on the first incident.

Power and Cooling

This is the headline difference between the R350 and the appliance-tier R250: the R350 ships with dual hot-plug redundant power supplies. A power-supply failure does not take the server offline, and a failed unit is replaced without downtime. PSU tiers run in the 600W to 700W class, in Platinum and Titanium efficiency, with the exact tier confirmed per SKU at quote time; for a single-CPU four-drive build the lower tier is typically sufficient. Redundant power is the reason most buyers choose the R350 over the R250 for anything that has to stay up.

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 E77S. Fits standard-depth racks and most short-depth cabinets.
• PCIe expansion: three PCIe Gen4 slots plus a dedicated controller position, all low-profile half-length. The dedicated PERC slot keeps the RAID card off the three general-purpose slots.
• Parts availability: strong. The R350 is a current 15th-gen platform; drives, redundant power supplies, DDR4 UDIMMs, PERC 11 controllers, and BOSS-S2 cards are all readily sourced, and Dell platform support for 15th gen is active.
• Accessories we recommend: a BOSS-S2 boot card so the OS stays off the four front bays; the Dell A12 1U sliding rail kit that fits the R340, R350, and R360 chassis; and any 10 GbE NIC specified at order time so the slot budget is planned.
• Platform notes: hot-plug drive bays and dual hot-plug redundant PSUs, so drives and power are serviceable without downtime; no NVMe on the front backplane; CPU integrated graphics disabled with video via the iDRAC9 Matrox G200; rear hot-plug BOSS-S2 rather than the R250's BOSS-S1.

Our Assessment

Where it excels: The R350 4-Bay 3.5" is the right answer for a small-business or branch-office production server that needs redundant power and serviceable storage without the cost of a dual-socket platform. File and print serving, a domain controller, a small SQL or line-of-business database, a backup or Veeam repository target, a small departmental NAS, and two to four light virtual machines all sit comfortably inside its envelope. The redundant PSUs and hot-plug bays make it appropriate for any role that has to stay up and be serviced without a maintenance window.

Where to look instead: If the role needs SFF density rather than LFF bulk capacity, the R350 8-Bay 2.5" is the same platform with eight smaller bays. If two drives and a single power supply are genuinely enough and cost is the priority, the lower-tier R250 4-Bay 3.5" Hot-Swap covers it. If the deployment needs more than eight cores, more than 128 GB of memory, or registered DIMMs, the dual-socket R450 is the platform; for a larger 2U chassis in the same generation, the R750xs 8-Bay 3.5" is the step up. GPU work belongs on the R750.

Bottom line: This is the production-appropriate entry Dell. An organization that wants a single, well-built, fully serviceable 1U server with redundant power and four LFF bays, and that knows it will stay inside one Xeon E-2300 and 128 GB of memory, gets exactly what it needs here at entry-tier cost. The typical buyer is an IT generalist or a managed-service provider standing up a branch or small-office server where uptime and serviceability matter but the workload does not justify a dual-socket box.

Where the R350 Fits in 2026

The R350 is Dell's 15th-generation entry server, launched in 2021 on the Rocket Lake Xeon E-2300. As of 2026 it is one generation behind the 16th-gen entry successor, the R360 on the Xeon E-2400, which we do not currently stock; the R360 is the path forward for a buyer who specifically wants the newest entry silicon and DDR5 memory. In the other direction, the 14th-gen predecessor is the R340 4-Bay 3.5" on the Xeon E-2100 and E-2200; it is still serviceable but a generation older, with slower DDR4 and an earlier management baseline.

Unlike the older Dell 13th and 14th-gen platforms, the R350 does not yet warrant an end-of-life conversation. It is recent enough that platform support, parts, and drivers are current, which is part of why it makes sense as a Surplus New or Refurbished purchase rather than a closeout. The cross-vendor counterpart on the HPE side is the ProLiant DL20 Gen11, the equivalent entry single-socket 1U; we name it for buyers comparing vendors, though the two platforms are not interchangeable at the parts level.

Honest Limitations

• 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.
• Unbuffered ECC memory only. The four slots take UDIMMs only, capped at 128 GB. No RDIMM or LRDIMM path exists on this platform.
• No NVMe. The front backplane is SAS/SATA only. Flash performance comes from SAS/SATA SSDs, not U.2 NVMe.
• Parity RAID requires the H755. The entry H355 is RAID 0/1/10 only; RAID 5 or 6 needs the H755 controller.
• 1 GbE onboard networking. No 10 GbE LOM and no NDC; faster networking is an add-in card in one of the three slots.
• Not a GPU platform. No accelerator path; see GPU Support above.

Workload Fit

Where to Look Instead

• Same platform, SFF density: R350 8-Bay 2.5", eight small-format bays for SSD density instead of four LFF bays.
• Lower cost, single power supply: R250 4-Bay 3.5" Hot-Swap, the appliance-tier entry without redundant power.
• Up a tier for cores and memory: R450 4-Bay 3.5", dual-socket Xeon Scalable with registered memory beyond the entry ceiling.
• Larger 2U chassis, same generation: R750xs 8-Bay 3.5", more drives and expansion in a 2U form factor.
• Previous generation: R340 4-Bay 3.5", the 14th-gen entry predecessor on the Xeon E-2100 and E-2200.
• Rail kit: the Dell A12 1U sliding rail kit for the R340, R350, and R360 chassis.

Ready to Configure?

Tell us the workload, the storage capacity and RAID level you need, 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-S2 boot card with a technician who knows the platform. Every R350 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.