How many network ports does this adapter provide?

The provided specifications list 10 Gigabit SFP+ x 2 and 2 x 10Gb Ethernet - SFP+, so this adapter provides two network ports. The dual-port layout is the clearest confirmed interface detail in the product data and is the main planning point for server connectivity.

What bus interface does the adapter use?

It uses a PCI Express 3.0 x8 bus interface and is described as a plug-in card. That makes slot compatibility a primary check during server procurement, since the host must support a PCIe 3.0 x8 expansion card.

What Ethernet speed is specified for this adapter?

The product is specified as a 10 Gigabit Ethernet adapter, with a data link protocol of 10 Gigabit Ethernet. The source data also identifies it as a 10GbE 2-port adapter, confirming that the rated network class is 10GbE.

Is this adapter intended for a specific server family?

Yes. The product category states that it is a 10GbE 2-port 557SFP+ PCIe 3.0 x8 SFP+ network adapter for ProLiant Gen9 servers. That makes ProLiant Gen9 the only server family explicitly supported by the provided product description.

What form factor is listed for the adapter?

The adapter is listed as a plug-in card. Combined with the PCI Express 3.0 x8 interface, this indicates a standard internal expansion card design rather than an external network device.

788991-001 - HPE 788991-001 10Gb 2-port SFP+ Network Adapter

Name: HPE 788991-001 10Gb 2-port SFP+ Network Adapter
Brand: HPE
SKU: 788991-001
Price: 140 USD
Availability: InStock

788991-001 - HPE 788991-001 10Gb 2-port SFP+ Network Adapter | US IT Hardware

Product overview

The HPE Ethernet 10Gb 2-port 557SFP+ Adapter is an enterprise network adapter with dual 10 Gigabit SFP+ ports. It is a plug-in card built for PCI Express 3.0 x8 connectivity and uses wired 10 Gigabit Ethernet. The product data identifies it as a 2-port 10GbE adapter for ProLiant Gen9 servers. Its listed networking interfaces are 2 x 10Gb Ethernet SFP+, making it suitable for environments that require dual-port fiber or direct-attach 10GbE connectivity. The provided specifications do not list power consumption or additional performance metrics, so procurement teams should evaluate it based on the confirmed port count, bus interface, and product category. This SKU is 788991-001, and the model is positioned as an enterprise adapter within HPE networking accessories.

Dual 10Gb SFP+ ports
PCI Express 3.0 x8
Wired 10 Gigabit Ethernet
Plug-in card form factor
Enterprise product level
For ProLiant Gen9 servers

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Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

Connectivity Technology
Manufacturer part #	788991-001
Brand	HPE
Condition	New
Model	557SFP+
PXE Support	Yes
Product Line	HPE Ethernet 10Gb 2-port 557SFP+ Adapter
Product Type	PCI Express dual-port 10Gb Ethernet network adapter
Compliant Standards	IEEE 802.3; IEEE 802.1Q; IEEE 802.3x; IEEE 802.3ad (LACP); IEEE 802.3ae; IEEE 802.3p; IEEE 802.1ab (LLDP)
Jumbo Frames Support	Yes
Adapter Classification	Converged Ethernet Network Adapter

Compatible systems

Confirmed compatible with select HPE ProLiant DL20 Gen9 and DL560 Gen9 rack servers.

HPE ProLiant DL Series
Model: DL20 Gen9
Form factor: Rack
Generation: Gen9
Listed under Designed For for HPE 788991-001 dual port 10Gb 557SFP+ adapter.
HPE ProLiant DL Series
Model: DL560 Gen9
Form factor: Rack
Generation: Gen9
DL560 Gen9 Base, Entry, Performance variants listed as designed for 788991-001.

Best for

ProLiant Gen9
Designed for ProLiant Gen9 servers, based on the product category provided. It fits deployments that need an HPE adapter identified as a 10GbE 2-port 557SFP+ PCIe 3.0 x8 SFP+ network adapter for that server family.
Dual-port 10GbE
Appropriate for environments that require two 10 Gigabit Ethernet ports. The provided specifications list 10 Gigabit SFP+ x 2 and 2 x 10Gb Ethernet - SFP+.
PCIe server expansion
Use in systems that support a PCI Express 3.0 x8 plug-in network adapter. The bus interface is explicitly listed as PCI Express 3.0 x8.

Details

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Large Send Offload (LSO)	Supported

Designed For Server Series	HPE ProLiant DL Series; HPE ProLiant ML Series; HPE ProLiant SL Series

Designed For ProLiant Models	DL20 Gen9; DL20 Gen9 Entry; DL20 Gen9 Performance; DL560 Gen9; DL560 Gen9 Base; DL560 Gen9 Entry; DL560 Gen9 Performance

TCP Segmentation Offload (TSO)	Supported

Additional Regulatory Standards	UL; BSMI; BSMI CNS 13438 Class A; EN 61000-3-2; ICES-003; EN 61000-3-3; EN55024; CISPR 22; EN55022 Class B; FCC Part 15 B; RoHS; VCCI Class B; KN22; KN24

Data Transfer Rate	10 Gbps per port

Networking Ports & Interfaces

Ports	2 x 10Gb Ethernet SFP+
Host Interface	PCI-Express 3.0 x8
Interface Type	SFP+
Data Link Protocol	10 Gigabit Ethernet
Interface Bus Type	PCI Express 3.0 x8
Network Technology	10 Gigabit Ethernet

HPE 788991-001 10Gb 2-port SFP+ Network Adapter