HP 503746-B21 PCI-E Networking NIC
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503746-B21 HP PCI Express Gigabit Fast Ethernet Server Refurbished

Availability: In Stock
Part Number#: 503746-B21
List Price was: $89.62
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Short Description:
503746-B21 HP PCI Express Gigabit Fast Ethernet Server Network Interface Card. Refurbished.
Product Condition:
Warranty provided by ALLHDD.COM:
30 Days

Maximize Bandwidth

To maximize bandwidth with the HP PCI Express Gigabit Fast Ethernet Server Network Interface Card, there are several things that you can do:

  • Use full-duplex mode: By default, the card operates in full-duplex mode, which allows for simultaneous transmission and reception of data. This can help maximize bandwidth by increasing the amount of data that can be transmitted at any given time.
  • Enable jumbo frames: Jumbo frames are larger than standard Ethernet frames, allowing for larger data payloads to be transmitted with less overhead. Enabling jumbo frames on the network interface card and on the network infrastructure can help maximize bandwidth.
  • Use quality of service (QoS): QoS is a networking feature that allows for the prioritization of network traffic based on the type of data being transmitted. By prioritizing high-priority data, such as video or voice traffic, over low-priority data, such as email, you can help maximize bandwidth for critical applications.
  • Upgrade network infrastructure: If you're using an older network infrastructure, upgrading to newer and faster networking equipment can help maximize bandwidth. For example, upgrading to Gigabit Ethernet switches and routers can provide faster data transfer rates and help eliminate network bottlenecks.
  • Optimize server performance: Maximizing server performance can also help maximize bandwidth. Ensure that the server is properly configured, with sufficient memory and processing power to handle the demands of the network.

Scalable Networking Solutions

Scalable networking solutions refer to networking solutions that can grow and adapt as your network needs change. With the increasing demand for bandwidth and the proliferation of data-intensive applications, it's essential to have a networking infrastructure that can scale up to meet these demands.

Here are some scalable networking solutions that can be used with the HP PCI Express Gigabit Fast Ethernet Server Network Interface Card:

  • Virtualization: Virtualization allows multiple virtual machines to run on a single physical server, maximizing server utilization and reducing the need for additional hardware. The HP PCI Express Gigabit Fast Ethernet Server Network Interface Card can be used with virtualization platforms such as VMware, Hyper-V, and KVM.
  • Load balancing: Load balancing distributes network traffic across multiple servers or network interfaces, helping to prevent bottlenecks and ensure that network resources are used efficiently. The HP PCI Express Gigabit Fast Ethernet Server Network Interface Card can be used with load balancing solutions such as HAProxy and NGINX.
  • Network virtualization: Network virtualization allows you to create virtual networks that are isolated from each other, providing enhanced security and flexibility. The HP PCI Express Gigabit Fast Ethernet Server Network Interface Card can be used with network virtualization solutions such as VMware NSX and Open vSwitch.
  • Software-defined networking (SDN): SDN is a networking approach that separates the control plane from the data plane, allowing for greater programmability and automation. The HP PCI Express Gigabit Fast Ethernet Server Network Interface Card can be used with SDN solutions such as OpenFlow and Cisco ACI.

By implementing these scalable networking solutions, you can ensure that your network infrastructure can grow and adapt to meet your changing needs, while maximizing performance and efficiency. The HP PCI Express Gigabit Fast Ethernet Server Network Interface Card can be an essential component of these solutions, providing fast and reliable network connectivity to your servers and applications.

Maximize Connectivity

Maximizing connectivity is essential for ensuring fast and reliable access to network resources. Here are some strategies for maximizing connectivity with the HP PCI Express Gigabit Fast Ethernet Server Network Interface Card:

  • Use high-quality Ethernet cables: The quality of Ethernet cables can have a significant impact on network performance. To maximize connectivity, use high-quality, shielded Ethernet cables that are capable of supporting Gigabit Ethernet speeds.
  • Ensure proper network card installation: To ensure maximum connectivity, it's important to properly install the HP PCI Express Gigabit Fast Ethernet Server Network Interface Card. Follow the manufacturer's instructions carefully and ensure that the card is securely seated in the PCIe slot.
  • Update drivers and firmware: Keeping drivers and firmware up to date is essential for maximizing connectivity. Check the HP website regularly for updates and install them as needed.
  • Enable link aggregation: Link aggregation allows multiple network interfaces to be combined into a single virtual interface, providing increased bandwidth and redundancy. The HP PCI Express Gigabit Fast Ethernet Server Network Interface Card supports link aggregation, allowing for maximum connectivity and performance.
  • Use network monitoring tools: Network monitoring tools can help identify connectivity issues and pinpoint areas that need improvement. Use tools such as Wireshark, PingPlotter, and SolarWinds Network Performance Monitor to monitor network traffic and diagnose connectivity issues.

By implementing these strategies, you can maximize connectivity with the HP PCI Express Gigabit Fast Ethernet Server Network Interface Card, ensuring fast and reliable access to network resources and improving overall network performance.

General Information

  • Manufacturer: HP
  • MPN: 503746-B21
  • Device Type : Network Adapter
  • SKU: 503746-B21
  • Form Factor : Plug-In Card - Low Profile
  • Interface (Bus) Type : Pci Express X1
  • Spare Part: NC112T


  • Connectivity Technology : Wired
  • Cabling Type : Ethernet 10base-T, Ethernet 100base-Tx, Ethernet 1000BASE-T
  • Data Link Protocol : Ethernet, Fast Ethernet, Gigabit Ethernet
  • Data Transfer Rate : 1 GBPS
  • Status Indicators : Link Activity, Port Transmission Speed
  • Features : Auto-Negotiation, Wake On Lan (WOL)

Compliant Standards

  • IEEE 802.3, IEEE 802.3U, IEEE 802.1Q, IEEE 802.3AB, IEEE 802.1P,
  • IEEE 802.3X, IEEE 802.3AD (LACP)

Expansion / Connectivity

  • Interfaces : 1 X Network - Rj-45
  • Compatible Slots : 1 X Pci Express X1
  • Processor / Memory:
  • Processor : 1 X 82574l - Intel
  • Ram : 32 KB


  • Compliant Standards: ACPI, FCC Class B certified, UL, VCCI Class B ITE, BSMI CNS 13438 Class A, CISPR 22 Class B, EN 60950, UL 1950, VCCI-II, EN55024, EN55022 Class B, ICES-003 Class B, MIC, ACA

Software / System Requirements

  • OS Required: SuSE Linux Enterprise Server, SunSoft Solaris 9, SCO OpenServer 5.0.7, Microsoft Windows Server 2003 Enterprise Edition, Microsoft Windows Server 2003 Web Edition, Microsoft Windows Server 2003 Standard Edition, Microsoft Windows Server 2003, UnixWare 7.1.3, Novell NetWare 6.5, Microsoft Windows Small Business Server 2003, Red Hat Enterprise Linux, UnixWare 7.1.4, SunSoft Solaris 10, Microsoft Windows Server 2003 Standard x64 Edition, Microsoft Windows Server 2003 Enterprise x64 Edition, SCO OpenServer 6

Dimensions & Weight

  • Depth: 5.1 in
  • Height: 2.2 in
  • Environmental Parameters
  • Min Operating Temperature: 32 °F
  • Max Operating Temperature: 131 °F

About Refurbished Products

Refurbished products are typically refurbished by an Original Manufacturer or an affiliate of the manufacturer or 3rd party facility. This product may have minor blemishes due to normal product usage and doesn't necessarily come with documentation and software unless indicated, but has been well tested and generally has never had any defects.

Adding gigabyte network connectivity is one of the best decisions users can make in the modern world. This is what the NIC (Network Interface Card) offers. This highly advanced networking device offers users a dedicated computer network connection.

The network interface card's ability to support wired and wireless network communications makes it one of the best choices. Individual users and IT professionals will find them very useful.

NIC enables adequate communication between computers. The computers may either be connected over a Local Area Network or over larger-scale networks via an IP. Regardless of the connection type, the network interface card offered at AllHDD works at optimal rates.

When users choose network interface card options here, they get the most reliable hardware circuitry. That is, there's a synergy between a data link and a physical layer in one device. The circuitry enables the physical layer to process data so that the processes involving the data link layer can run effectively on it.

Gone are the days when network controllers were the real deals. Today, a network interface card can serve as an expansion module in computer systems or routers. The specifications of the NIC users will get correspond with the standard of various network options.

Network Interface Card Options

Internal Network Interface Cards

Users will find NIC (Network Interface Cards) that users can insert directly onto the computer's motherboard. For these options to offer network access, there's the need for network cables. There are NIC options that use connections like Peripheral Component Interconnect (PCI). Others connect with Industry Standard Architecture (ISA).

External Network Interface Cards

Laptops and desktops which do not come with an internal network interface card use the external option. There are two options for the external NIC. The first is the wireless network cards, which will be attached directly to the motherboard.

Unlike the internal option, there will be no need for networking cables in this case. These options are the best when users need to travel or access wireless signals.

On the other hand, there are several USB options ranging from 1 port to 4 port NIC. They are compact, and they add a network connection to a USB-enabled computer system. Many of these NIC options work with 10-100-1000 Mbps networks.

They are also ideal replacements for local area network (LAN) adapters and similar laptop accessories. Users will find USB network interface cards that support features such as VLAN tagging, Jumbo Frames, and Wake on LAN (WOL). They are the most reliable Gigabit network for versatile home and business use.

Key Features

  • Fast and Reliable Performance. The network interface cards have impressive speed ratings with options up to 1000 Mbps. They enable the connection of multiple computers without the fear of failure.
  • Updated and Incorruptible Driver. The driver that passes data between the NIC and the computer system ensures optimal performance.
  • Connectivity LED. These NIC (Network Interface Cards) come with integrated LED indicators to notify users when there is a network connection and transfer of data.

Here, you can check more available conditions of your desired product 503746-B21 at a competitive price. We are trying our best to meet your needs on the enterprise-level computer, server, data centre, and networking hardware. You are welcome to ask our live chat or get live representative support over the phone.


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ALLHDD guarantees that the products will not have defects in material that will affect the product's functionality during the Standard Warranty Period. The warranty period starts when the merchandise/items from our warehouse.

What does ALLHDD.Com warranty cover?

30-days to 3 years warranty:

Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

What is not covered by our warranty?

The reason why our warranty does not cover any problem caused by the following conditions:

(a) misuse of hardware; accidental damage; carelessness product(s) damage; shock; temperature beyond the specification of any product; faulty installation; operation; modification of goods;

(b) any misuse outside the instructions in the user manual for any specific product;

(c) damaged caused by other hardware or equipment. The warranty will void if the item is returned with physical damage, damage to the retail box, removed from the box, counterfeit labels/labelled by them, or any modifications of internal and external covers. Data loss or damages to any other equipment we do not cover by our offered warranty.

What is the Manufacturer/Brand Warranty?

In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).

For the server parts (i.e., Dell, HPE) to get Full coverage of the warranty server must have a full 3- 5 years warranty. However, ALLHDD.COM will cover the warranty duration if any Manufacturer doesn't support the advertised warranty and there is no refund for those.
Final Sale items are non-returnable/refundable in any situation. Any question? please ask our team before the shipment.

Important notes:

We can provide additional warranty service/support for any product you purchase from us if you need additional warranty coverage before finalizing the order from ALLHDD.Com. You need to ask in live chat/help or call us for more information.

Individual product warranty mentioned on each item product description page/detail page.

Free Technical support on purchased items, our expert consultancy over the phone, by email, by live chat, or by remote login.


Shipping Options and Estimated Delivery Time

UPS Shipping Options:

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Estimated delivery time: 4-7 business days

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UPS Next Day Air® First Overnight - Early A.M
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UPS® First Overnight - Saturday
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FedEx Shipping Options:

FedEx Ground®
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Estimated delivery time: 4−7 business days, based on the distance to the destination.

FedEx Express Saver®
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Available throughout all 50 states

FedEx Standard Overnight®
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FedEx Priority Overnight®
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Available throughout all 50 states

FedEx First Overnight®
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Available throughout all 50 states

Worldwide Shipping Options:

UPS®/FedEx® International Economy

Estimated delivery time: 4-7 business days

UPS®/FedEx® International Priority

Estimated delivery time: 2-4 business days

UPS®/FedEx® Ground Shipping Canada

Estimated delivery time: 5-8 business days

Important notes:

  • The processing of orders with Ground Shipping can take up to 24-48 hours. But we try to process all orders the same day.
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