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

Also listed as: P47777-001, P49830-001, 05-50077-00, 05-50077-01 · made by Broadcom

The HPE MR416i-p Gen11 is a high-performance tri-mode PCIe storage controller engineered around Broadcom MegaRAID technology, offering 16 internal lanes and 8GB flash-backed write cache (FBWC). It supports high-density SAS, SATA, and direct NVMe drive topologies across HPE ProLiant Gen11 servers with DMTF SPDM security validation. When procuring on the secondary market, ensure the optional HPE Smart Storage energy pack capacitor cable is included and inspect PCIe edge pins for damage.

Specifications

About the P47777-B21

P47777-B21 is HPE's MR416i-p Gen11 Storage Controller, a full-featured tri-mode PCIe Gen4 x8 plug-in card based on Broadcom MegaRAID SAS3916 silicon. Equipped with 16 internal lanes and 8GB of 72-bit DDR4-2666 Flash-Backed Write Cache (FBWC), it represents HPE's flagship PCIe RAID controller for ProLiant Gen11 compute platforms. Supporting hardware RAID 0, 1, 5, 6, 10, 50, and 60, it manages SAS (12Gb/s), SATA (6Gb/s), and direct-attached U.3/U.2 NVMe (16Gb/s) solid state drives in both hardware RAID and passthrough JBOD modes.

Compatibility

This standard height, half-length (HH/HL) PCIe card fits standard PCIe riser slots in HPE ProLiant Gen11 servers such as the DL360 Gen11, DL380 Gen11, DL385 Gen11, and ML350 Gen11. Connecting drives requires compatible internal Mini-SAS HD or SlimSAS cabling to tri-mode backplanes. Write-cache acceleration requires an HPE Smart Storage energy pack (battery or hybrid capacitor) connected via an onboard header. It is NOT backward compatible with ProLiant Gen10 servers, which rely on the Smart Array P-Series family. The option kit is P47777-B21, with spare numbers P47777-001 and P49830-001.

How to identify a genuine unit

A genuine P47777-B21 carries an HPE serial label displaying option code P47777-B21, spare number P49830-001 or P47777-001, and the Broadcom PCB model identifier. In iLO 6, the controller is identified under Storage as the HPE MR416i-p Gen11 Controller, featuring SPDM (Security Protocol and Data Model) certificate verification and Silicon Root of Trust attestation. Generic Broadcom MegaRAID 9560-16i cards will lack HPE SPDM authentication and will fail to integrate with HPE MegaRAID Storage Administrator (MRSA) and StorCLI via iLO.

Buying used

When evaluating second-hand MR416i-p controllers, verify that the PCIe bracket is securely fastened, inspect the PCIe x8 gold edge fingers for scratches, and examine the internal SlimSAS connectors for bent pins. Crucially, confirm whether the sale includes the necessary cache backup capacitor cable, as sourcing the proprietary energy pack cable separately can be difficult. Ask the seller to verify in StorCLI that all 8GB of cache memory tests healthy and that no capacitor charging faults exist.

Reference prices (last 14 days, updated 2026-10-27)

Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.

Fits these models

• HPE ProLiant DL380 Gen11
• HPE ProLiant DL360 Gen11
• HPE ProLiant DL385 Gen11
• HPE ProLiant DL325 Gen11
• HPE ProLiant DL560 Gen11
• HPE ProLiant ML350 Gen11

Equivalent part numbers

• Broadcom MegaRAID 9560-16i Broadcom standard retail equivalent tri-mode controller

FAQ

Sources

• HPE Compute MR Controllers QuickSpecs, checked 2026-10-27