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647594-B21: HPE Ethernet 1Gb 4-port 331FLR Adapter

HPE 647594-B21 Network adapter
HPENetwork adapters

Also listed as: 684208-001, 629133-001, 629133-002, BCM95719 · made by Broadcom

The HPE Ethernet 1Gb 4-port 331FLR Adapter is a FlexibleLOM network adapter powered by the Broadcom BCM5719 chipset for HPE ProLiant Gen9 servers. Installing into the dedicated FlexibleLOM slot, it provides 4 Gigabit Ethernet copper ports for management, virtualization vSwitch trunking, and clustering without consuming standard PCIe expansion slots.

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Specifications

Part number647594-B21
BrandHPE
Made byBroadcom
TypeNetwork adapters
Other numbers684208-001, 629133-001, 629133-002, BCM95719
Statusend of sale
ControllerBroadcom BCM5719
Host interfacePCIe 2.0 x4 (FlexibleLOM form factor)
Network ports4x 10/100/1000BASE-T RJ-45 ports
Data rate1 Gb/s per port (4 Gb/s aggregate)
FeaturesTCP/IP checksum offload, Large Send Offload (LSO), Jumbo Frames, IEEE 802.1Q VLAN, PXE boot

About the 647594-B21

647594-B21 is the HPE Ethernet 1Gb 4-port 331FLR FlexibleLOM adapter for HPE ProLiant Gen9 rack servers. Powered by the quad-port Broadcom BCM5719 Ethernet controller, it delivers reliable 1GbE connectivity across four copper RJ-45 interfaces while occupying the dedicated FlexibleLOM motherboard mezzanine bay.

Compatibility

Compatible with all HPE ProLiant Gen9 servers equipped with a FlexibleLOM connector, including DL380 Gen9, DL360 Gen9, DL560 Gen9, DL580 Gen9, ML350 Gen9, Apollo 4200 Gen9, and SimpliVity 380 Gen9. Supported across VMware ESXi, Windows Server, and Red Hat Enterprise Linux.

How to identify a genuine unit

Proprietary FlexibleLOM mezzanine card with four integrated RJ-45 copper Ethernet ports, link status LEDs, and dual thumbscrew mounting bracket. White barcode sticker shows option part number 647594-B21, spare part number 684208-001, and assembly part number 629133-001.

Buying used

Inspect RJ-45 port connector spring pins for bent contacts or debris. Check the FlexibleLOM edge connector for scoring or tarnishing. Verify in iLO 4 that all four MAC addresses are enumerated correctly and that link speed auto-negotiates to 1000 Mb/s Full Duplex on each port.

Reference prices (last 12 months, updated 2026-10-27)

Used: USD 14 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
ebay.comusedUSD 14Tested working HPE 331FLR 4-port 1GbE FlexibleLOM2026-10-27

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

Fits these models

Check compatibility with HPE

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that HPE has tested with the HPE 647594-B21.

Equivalent part numbers

FAQ

What is the benefit of FlexibleLOM over standard PCIe adapters?

FlexibleLOM integrates directly into the motherboard backplane, preserving all standard PCIe expansion slots for storage controllers, GPUs, or high-speed fabric adapters.

Does the 331FLR adapter support PXE boot?

Yes, all four ports support PXE boot, UEFI network stack booting, and Wake-on-LAN.

Buying or selling 647594-B21?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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