P47777-B21 - HPE MR416i-p Gen11 Storage Controller

HPE P47777-B21 — HPE MR416i-p Gen11 x16 Lanes 8GB Cache PCI SPDM Plug-in Storage Controller

What it is

P47777-B21 is a Gen11 hardware RAID/storage controller for HPE ProLiant servers.
It’s the HPE MR416i-p Gen11 in PCIe plug-in card form (“-p”), giving you a modern MegaRAID-class controller with 16 internal lanes and 8GB cache, plus Gen11-era security (SPDM/HWRoT).

Why buyers pick P47777-B21 (plain English)

• Serious hardware RAID for Gen11
  Ideal when you want full RAID offload and consistent performance instead of relying on onboard SATA/VROC only.

• More lanes for bigger backplanes
  The x16 internal lane design fits larger SFF/LFF drive sets cleanly.

• Big cache for write efficiency
  8GB cache boosts RAID performance for bursty or write-sensitive workloads.

• Gen11 security + manageability
  SPDM-based component authentication ties into iLO 6-era platform security.

• Plug-in card flexibility
  Uses a PCIe slot, so it’s a straightforward add-on for many DL/DX/ML Gen11 servers.

60-second spec box (P47777-B21)

Controller family

• HPE MR416i-p Gen11

Form factor / host interface

• PCIe plug-in card (“-p”)

• PCIe Gen4 x8 host link

Internal lanes / ports

• x16 internal lanes

• Typically presented via SlimSAS internal connectors (backplane-dependent)

Cache

• 8GB flash-backed cache

Drive / protocol support

• SAS 12G and SATA 6G

• NVMe support depends on server/backplane topology

RAID levels

• Supports common enterprise RAID: 0/1/5/6/10/50/60

Target platforms

• HPE ProLiant Gen11 servers that take PCIe storage controllers

Where it fits (and when to choose something else)

Perfect for:

• Gen11 servers needing hardware RAID + large lane count

• Mixed SAS/SATA arrays with performance expectations

• Larger SFF/LFF backplanes where x8-lane controllers feel tight

Choose something else if:

• You want OCP form factor to save PCIe slots → choose an “-o” MR416i

• You don’t need cache/RAID → MR216i class (no-cache) is cheaper

• You’re building pure NVMe without RAID → a native NVMe path may be simpler

TL;DR

P47777-B21 is the HPE MR416i-p Gen11: a PCIe Gen4 hardware RAID controller with x16 internal lanes and 8GB cache, built for ProLiant Gen11 storage performance, scale, and security.