P58335-B21 - HPE MR408i-o Gen11 SPDM Storage Controller

HPE P58335-B21 — MR408i-o Gen11 x8 Lanes 4GB Cache OCP SPDM Storage Controller

What it is

P58335-B21 is an HPE Gen11 storage/RAID controller in OCP form factor.
Specifically, it’s the HPE MR408i-o Gen11 — an OCP SPDM (secure) storage controller for ProLiant Gen11 servers. It provides internal SAS/SATA/NVMe connectivity plus hardware RAID, with 4GB cache and modern Gen11 security/management integration.

Why buyers pick P58335-B21 (plain English)

• Real hardware RAID for Gen11
  Adds dependable RAID offload instead of relying only on onboard SATA/VROC.

• OCP “-o” form factor keeps PCIe slots free
  Installs in the OCP storage slot, leaving PCIe bays open for NICs/GPU/other cards.

• Cache-backed performance
  4GB cache helps with bursty workloads and improves RAID write efficiency.

• Gen11 security-ready (SPDM)
  Designed for secure component authentication and modern ProLiant supply-chain protections.

60-second spec box (P58335-B21)

Controller family

• HPE MR408i-o Gen11 (Compute MR Gen11 series)

Form factor / interface

• OCP storage controller (“-o”)

• PCIe Gen4 x8 lanes

Cache

• 4GB cache (flash-backed)

Drive / protocol support

• Supports SAS 12G, SATA 6G, and NVMe backplane configurations (platform dependent)

RAID levels

• Hardware RAID including 0/1/5/6/10/50/60

Ports / lanes

• 8 internal lanes via internal SlimSAS-style connectoring

Management

• Managed through HPE storage tools and Gen11 platform integration (UEFI/Redfish/CLI utilities)

Warranty

• 3-year parts standard option warranty

Where it fits (and when to choose something else)

Perfect for:

• ProLiant Gen11 servers needing hardware RAID + cache

• Mixed SAS/SATA builds where you want reliable RAID performance

• OCP-slot installs that keep PCIe expansion free

Choose something else if:

• You need more lanes / more cache → move up to MR416i Gen11 class

• You’re building pure NVMe without RAID → an NVMe-only path may be simpler

• You’re on Gen10/Gen10+ → use the matching Gen10-series controller SKUs

TL;DR

P58335-B21 is HPE’s MR408i-o Gen11 OCP RAID controller:
PCIe Gen4 x8, 8 internal lanes, 4GB cache, SAS/SATA/NVMe-ready (platform dependent), and full hardware RAID — the standard Gen11 OCP storage controller upgrade.