Dell PERC H755 RAID Controller

Brand: Dell | Category: Accessories & Components

SKU: 405-ABCR | Part #: N5X7M | MPN: N5X7M

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Dell's PERC H755 RAID controller (part number N5X7M) arrives as a full-height, half-length PCIe add-in card that slots directly into any Dell PowerEdge 14th or 15th generation server without requiring external brackets, custom cabling harnesses, or lengthy configuration workflows. The physical footprint is deliberately compact—it occupies a single full-height slot while consuming only half the length of a standard PCIe card bay, which means even densely populated server builds rarely face space conflicts. Installation consists of aligning the card with its target PCIe 4.0 x8 slot, pressing down until the retention clip engages, and connecting two internal SFF-8643 (Mini-SAS HD) connectors to your storage expander or direct-attached drive enclosure. For storage architects and data centre operations teams evaluating this controller, that simplicity translates into faster deployment cycles and lower labour costs during server refresh cycles or emergency hardware swaps.

The H755 connects to storage via dual 12Gb/s SAS or 6Gb/s SATA interfaces, each SFF-8643 port capable of addressing up to 16 physical drives, yielding a maximum of 32 drives per controller. Dell engineered this controller for environments where capacity scaling and redundancy matter equally—think hybrid cloud backends, virtual machine datastores, or the warm-tier storage layers behind high-performance AI training clusters. The controller's PCIe 4.0 x8 host interface provides sufficient bandwidth to sustain concurrent read/write operations across dozens of drives without becoming a bottleneck, even under the sustained throughput demands of database workloads or large-scale analytics jobs. A storage engineer planning drive configurations will appreciate that the N5X7M supports RAID levels 0, 1, 5, 6, 10, 50, and 60, meaning you can construct tiered redundancy strategies that balance capacity efficiency against fault tolerance—RAID 6 or 60 for critical data, RAID 5 or 10 for general-purpose storage, or RAID 0 for temporary scratch arrays that tolerate data loss.

Memory protection on this Dell controller relies on 4GB of DDR4 cache paired with a supercapacitor-backed Cache Vault that commits unwritten data to non-volatile flash if power loss occurs. That architecture means you can safely enable write-back caching without risking data corruption during unexpected shutdowns or UPS failures—particularly valuable in facilities where planned maintenance windows are rare and outages cascade through dependent services. Dell also baked in sector-size flexibility, supporting 512-byte native (512n), 512-byte emulated (512e), and 4096-byte native (4Kn) drives within the same logical array, which eases migration paths when swapping older media for modern high-capacity drives. The controller's Local Key Management (LKM) subsystem works transparently with Dell self-encrypting drives (SEDs), encrypting data at the physical layer without imposing a CPU penalty on the host server. System administrators responsible for regulatory compliance in financial services, healthcare, or government sectors will find this native encryption capability reduces the compliance burden compared to software-based encryption stacks.

Management of the PERC H755 happens through multiple pathways: the Dell OpenManage suite provides graphical visibility into array health and drive status across your entire infrastructure, the iDRAC with Lifecycle Controller offers firmware updates and out-of-band diagnostics, the PERC CLI grants command-line control for automation and scripting, and the PERC GUI delivers direct browser-based access to individual controller settings. The controller runs with Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise, and VMware ESXi operating systems, covering the majority of enterprise workloads without requiring vendor-specific drivers or kernel patches. Advanced features like Patrol Read continuously scan your arrays for latent sector errors before they cascade into data loss, Background Initialization keeps newly inserted drives transparent to your RAID set during the rebuild process, and hot-spare support automatically activates standby drives the moment a primary drive fails. For infrastructure teams running mission-critical databases or virtualisation stacks, these preventative mechanisms substantially reduce unplanned downtime incidents.

Omnixon Global stocks the Dell PERC H755 (N5X7M) as part of our core inventory serving data centre buildouts, AI infrastructure expansions, and enterprise storage refreshes across the UAE, GCC region, and into Asia and Europe. We work directly with infrastructure procurement teams, system integrators, and channel partners who need immediate availability, technical specification clarity, and supply chain certainty. If you are evaluating this controller for a current or upcoming deployment, we invite you to request a formal quotation—share your server platform, drive count, and intended RAID topology, and our team will confirm compatibility and lead times.

Platform Compatibility & Interface Specifications

• PCIe 4.0 x8 host interface compatible with Dell PowerEdge 14th and 15th generation servers (R6515, R6525, R7515, R7525, R6615, R6625, R7615, R7625 families)
• Dual SFF-8643 (Mini-SAS HD) connectors support up to 32 physical drives mixed between 12Gb/s SAS and 6Gb/s SATA media
• 4GB DDR4 cache with supercapacitor-backed Cache Vault ensures data protection during unexpected power loss events
• RAID 0, 1, 5, 6, 10, 50, and 60 support with Patrol Read, Background Initialization, Consistency Check, and hot-spare functionality
• Full-height, half-length PCIe card format integrates into standard PowerEdge slot configurations without external brackets or modifications
• Supported operating systems include Windows Server 2016 and later, RHEL 7.x/8.x, SUSE Linux Enterprise 12/15, and VMware ESXi 6.7 through 8.0
• Dell OpenManage, iDRAC Lifecycle Controller, PERC CLI, and PERC GUI provide layered management from graphical dashboards to command-line automation
• Local Key Management (LKM) encryption for self-encrypting drives (SEDs) with transparent data protection at the physical layer