Tag Archives: network interface card

PCI Vs PCI Express: What’s the Difference?

FacebookTwitterGoogle+LinkedInRedditTumblrShare

PCI Vs PCI Express are two different versions of internal bus standards for connecting or injecting peripheral devices into equipment like computers, network servers. But do you know about their relations? And could you tell the differences in PCI Vs PCI Express? To figure out these questions, an exploration for PCI and PCI Express will be introduced in this post.

What Does PCI Vs PCI Express Stands for?

What Is PCI?

 

PCI, also called peripheral component interconnect, is a connection interface standard developed by Intel in 1990. Originally, it was only used in servers. Later on from 1995 to 2005, the PCI was widely implemented in computer and other network equipment like network switch. Most commonly, PCI is used as the PCI-based expansion card to insert into the PCI slot in a motherboard of a host or server. In the expansion card market, the popular PCI expansion cards are NIC card or network interface card, graphics card, and sound card.

What Is PCI Express?

 

PCI Express Network Card

Figure 1: PCI Express Network Card

PCI Express, also abbreviated as PCIe, refers to the peripheral component interconnect express. As the successor of PCI, PCI Express is also a type of connection standard carried out by Intel in 2001, which provides more bandwidth and is more compatible with existing operating systems than PCI. Similar like PCI, PCIe also can be used as expansion cards like PCIe Ethernet card to insert into PCI Express slot.

Comparison of PCI Vs PCI Express

As the replacement of PCI, PCI Express differs with it in several aspects, such as working topology and bandwidth. In this part, a brief comparison of PCI Vs PCI Express will be made.

PCI Vs PCI Express in Working Topology: PCI is a parallel connection, and devices connected to the PCI bus appear to be a bus master to connect directly to its own bus. While PCIe card is a high-speed serial connection. Instead of one bus that handles data from multiple sources, PCIe has a switch that controls several point-to-point serial connections.

PCI Vs PCI Express

Figure 2: PCI Vs PCI Express

PCI Vs PCI Express in Bandwidth: Generally, the fixed widths for PCI are 32-bit and 64-bit versions, running at 33 MHz or 66 MHz. 32 bits with 33 MHz, the potential bandwidth is 133 MB/s, 266 MB/s for 66 MHz, and 532 MB/s for 64 bits with 66 MHz. As for PCIe card, the bandwidth varies from 250 MB/s to several GB/s per lane, depending on its card size and version. For more detail, you can refer to the post: PCIe Card Tutorial: What Is PCIe Card and How to Choose It?

PCI Vs PCI Express in Others: With PCI Express, a maximum of 32 end-point devices can be connected. And they support hot plugging. While hot plugging function is not available for PCI, it can only support a maximum of 5 devices.

FAQs About PCI Vs PCI Express

1. Is the speed for PCI slower than PCI Express?

Sure, the speed for PCIe is faster than PCI. Take the PCIe x1 as an example, it is at least 118% faster than PCI. It’s more obvious when you compare the PCIe-based video card with a PCI video card, the PCIe video card x16 type is almost 29 times faster than PCI video card.

2. Can PCI cards work in PCIe slots?

The answer is no. PCIe and PCI are not compatible with each other due to their different configurations. In most cases, there are both PCI and PCIe slots on the motherboard, so please fit the card into its matching slot and do not misuse the two types.

3. What is a PCIe slot?

PCIe slot refers to the physical size of PCI Express. By and large, there are four slot types: x16, x8, x4, and x1. The more the slot number, the longer the PCIe will be. For example, PCIe x1 is 25 mm in length, while PCIe x16 is 89 mm.

Summary

In this post, we make a comparison in PCI Vs PCI Express from their origin, working mode to their bandwidth, etc. In the final part, there are several frequently asked questions listed for your information. Hope this post will give you some inspirations in telling PCI Vs PCI Express.

What’s the Difference Between HBA, NIC and CNA?

HBA, NIC and CNA are three types adapters used in computer networking system. All perform to connect servers to switches, then what’s the differences between them? In this blog, knowledge of HBA, NIC and CNA will be provided.

HBA – Host Bus Adapter
Host bus adapter is a hardware device, such as a circuit board or integrated circuit adapter, that provides I/O processing and physical connectivity between a host system, such as a server, and a storage device. The HBA transmits data between the host device and the storage system in a SAN and relieves the host microprocessor of the tasks of storing data and retrieving data. The result of which is to improve server performance. HBAs are most commonly used in Fibre Channel (FC) SAN environments and are also used for connecting SCSI and SATA devices.

what is hba

NIC – Network Interface Card
Short for Network Interface Card, the NIC is also referred to as an Ethernet card and network adapter. It is an expansion card that enables a computer to connect to a network. Most new computers have either Ethernet capabilities integrated into the motherboard chipset, or use an inexpensive dedicated Ethernet chip connected through the PCI or PCI Express bus. A separate NIC is generally no longer needed. If the card or controller is not integrated into the motherboard, it may be an integrated component in a router, printer interface or USB device.

nic

CNA – Converged Network Adapter
A converged network adapter (CNA), also called a converged network interface controller (C-NIC), is a computer input/output device that combines the functionality of a host bus adapter (HBA) with a network interface controller (NIC). In other words, it “converges” access to, respectively, a storage area network and a general-purpose computer network. The CNA connects to the server via a PCI Express (PCIe) interface. The server sends both FC SAN and LAN and traffic to an Ethernet port on a converged switch using the Fiber Channel over Ethernet (FCoE) protocol for the FC SAN data and the Ethernet protocol for LAN data. The converged switch converts the FCoE traffic to FC and sends it to the FC SAN. The Ethernet traffic is sent directly to the LAN.

cna

What’s the Difference Between HBA, NIC and CNA?
In large enterprise companies, main servers usually have (at least) two adapters – FC HBA and Ethernet NIC to connect to the storage network (Fiber Channel) and computer network (Ethernet). CNAs converge the functionality of both the adapters into one.

hba-nic-and-cna
As you can see from the picture below, with the set up in the first diagram, two separate adapters are required on the server to connect to Ethernet based Computer Network and FC based Storage Network respectively. But the set up in the second diagram requires just one adapter (Converged Network Adapter – CNA) which carries both Ethernet traffic as well as FCOE traffic in a single cable. This cable connects to one of the Ethernet ports in the Converged Switch that has both Ethernet as well as Fiber Channel ports. This Converged Switch converts the FCOE traffic in to Fiber Channel traffic to be sent to the FC SAN over the Fiber Channel Network. The computer network traffic is directly sent to the LAN over the Ethernet Network.

Conclusion
Compared to use both HBA and NIC, using a single CNA to connect servers to storage and networks reduces costs by requiring fewer adapter cards, cables, switch ports, and PCIe slots. Besides, CNAs also reduce the complexity of administration because there is only one connection and cable to manage. To connect CNAs to your ToR or EoR switches can over both SFP+ SR (optical) or SFP+ direct attach copper cable. To connect CNAs to your servers can over Cat6 cables. All these cabling solutions can be provided in FS.COM. All at low price and high quality!

Related Article: Are White Box Switches Equal to OEM Switches?

Related Article: What’s the Difference: Hub vs Switch vs Router