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QuickSpecs
Standard Features
Performance
Product Features
Quad-port 1 Gigabit
Ethernet Throughput
Jumbo Frames
MSI and MSI-X
802.1Q VLANs
TCP/IP Stateless
Offloading
Time synchronization
Industry-leading hardware integration for low power
Quad-port, PCIe 2.0 1Gb Ethernet adapter for HP ProLiant Gen8 Rack and Tower servers and certain
G7 servers
Quad-port 1GbE provide up to 8 Gb full duplex throughput per adapter
Energy Efficient Ethernet (EEE) support
Optimized for virtual servers
Improved small packet performance
Supports the Preboot eXecution Environment (PXE)
The HP 331T adapter provides 2,000 Mbps full duplex Ethernet transfer rate per port (8 Gbps aggregate
full duplex) delivers outstanding network performance that improves response time and removes
bottlenecks. Four ports on a single adapter are ideal for high density, I/O slot constrained servers,
virtualization and security, applications, server consolidation, and increased network segmentation. The
total aggregate throughput of 8Gbps in full-duplex mode also meets the needs for customers desiring
high bandwidth but are not yet ready to move to 10 Gigabit Ethernet.
NOTE: Port enumeration on the 331T is from the top down, i.e. the port near the top of the adapter is port
#0 and the port closest to the gold teeth is port #3
The 331T adapter support for jumbo frames (also known as extended frames) permits up to a 9K byte (KB)
transmission unit (MTU) when running Ethernet, which is over five times the size of standard 1500-byte
Ethernet frame. Jumbo frames can help achieve higher throughput and better CPU utilization and are
particularly useful for database transfer and tape backup operations.
Up to 17 Message Signaled Interrupt (Extended) provides performance benefits for multi-core servers by
load balancing interrupts between CPUs/cores
IEEE 802.1Q virtual local area network (VLAN) protocol allows each physical port of the HP 331T to be
separated into multiple virtual NICs for added network segmentation and enhanced security and
performance. VLANs increase security by isolating traffic between users. Limiting the broadcast traffic to
within the same VLAN domain also improves performance.
For overall improved system response, the 331T supports standard TCP/IP offloading techniques
including:
TCP/IP, UDP checksum offload (TCO) moves the TCP and IP checksum offloading from the CPU to
the network adapter.
Large send offload (LSO) or TCP segmentation offload (TSO) allows the TCP segmentation to be
handled by the adapter rather than the CPU.
Hardware assist for IEEE 1588 and IEEE 802.1AS time synchronization implementations for time sensitive
applications
DA - 14215 Worldwide — Version 10 — September 10, 2013
HP Ethernet 1Gb 4-port 331T Adapter
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