The HP Ethernet 1Gb 4-Port 331T Adapter features the next generation of Ethernet integration, offering a single chip solution that reduces power requirements and optimizes I/O slot utilization. It delivers full line-rate performance across all ports with low power consumption. The HP 331T is ideal for virtualization, security, server consolidation, network segmentation, and other applications requiring maximum throughput and port density. The total aggregate throughput of 4Gb meets the needs of customers desiring high bandwidth. The HP 331T supports advanced features such as Large Send and Receive offload capability, TCP checksum and segmentation, VLAN tagging, MSI-X, jumbo frames, IEEE 1588, and virtualization features such as VMware NetQueue and Microsoft VMQ. Support for HP Sea of Sensors 3D Technology enhances server performance while reducing energy use and expense. The HP 331T is designed for maximum throughput and high port density. An aggregate, full duplex transfer rate of 8 Gbps per adapter delivers outstanding network performance that improves response time and removes bottlenecks. Comprehensive stateless offloads optimize host efficiency and VM density by leaving host CPU available for other duties. Virtualization support for VMware NetQueue and Microsoft VMQ help meet the performance demands of consolidated virtual workloads. Support for MSI/MSI-X provides performance benefits for multi-core servers by load balancing interrupts between CPUs/cores. Support for Energy Efficient Ethernet (EEE) reduces operating expenses.

System requirements
Compatible operating systems	Windows Server 2008 (32/64), Enterprise, Web, Embedded, R2 Microsoft Windows HPC Server 2008 Microsoft Windows 2008 Standard (32/x64) Microsoft Windows 2008 Enterprise (32/x64) Microsoft Windows Small Business Server 2011 (SBS V7) Microsoft Windows Small Business Server 2011 Essentials RHEL 5.7 x86/ AMD 64 & EM 64T RHEL 6.1 x86/ AMD 64 & EM 64T SLES10: x86 / AMD 64 & EM 64T SLES 11: x86 / AMD 64 & EM64T Solaris 10 VMWare vSphere 4.1/5.0 Citrix HyperV (Windows 2008 32 and 64)
Ports & interfaces
Connectivity technology	Wired
Host interface	PCI Express
Interface	Ethernet
Ethernet LAN (RJ-45) ports	4
Compatible memory cards	Not supported
Weight & dimensions
Width	68.6 mm
Depth	132.1 mm
Power
Power consumption (typical)	4.3 W
Operational conditions
Operating temperature (T-T)	0 - 55 °C
Storage temperature (T-T)	-65 - 85 °C
Operating relative humidity (H-H)	10 - 90%
Storage relative humidity (H-H)	5 - 95%
Network
Maximum data transfer rate	2000 Mbit/s
Networking standards	IEEE 802.1Q, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3az, IEEE 802.3u, IEEE 802.3x
Ethernet LAN	Y
Ethernet LAN data rates	10,100,1000 Mbit/s
Cabling technology	10/100/1000BaseT(X)
Wi-Fi	N
Full duplex	Y
Jumbo frames support	Y
Bandwidth	8 Gbit/s
Maximum operating distance	100 m
Other features
Cable type	Cat5
Data transfer rate	1 Gbit/s
Connector(s)	RJ-45
Design
Internal	Y
Product colour	Green, Grey
Chipset	Broadcom BCM5719
Certification	FCC Part 15 Class B ICES=--3, Issue 4 VCCI V3 (2010.04) Class B KN22 ClassB, KN24 EN55022:2006+A12007 class B EN55024:1998+A1:2011+A2; EN61000-3-2:2006, EN61000-3-3:2008 EN55022:2006 + A1:2007 Class B UL/cUL CE EN 60590
Logistics data
Harmonized System (HS) code	85176990