What is the difference between PCI E and PCI?

First of all, the difference between PCI Express and PCI is that the transmission mode has been transformed from parallel to serial. PCI Express uses a point-to-point serial connection, which is very different from the previous parallel channels, which allows each device to establish a separate data transmission channel. There is no need to request bandwidth from the entire system, so it is easy to reach high bandwidth that other interface devices cannot reach.

PCI Express interfaces vary according to the bit width requirements of the bus interface, and are divided into PCI Express 1x, 2x, 4x, 8x, 16x, and even 32x. As a result, the length of the PCI Express interface is also different. 1x the smallest, the bigger it is on the upper side.

At the same time, different PCI Express interfaces can also be backward compatible with other PCI Express small interface products. Devices that are both PCI Express4X can be plugged into PCI Express8X or 16X to work. This way, as long as you have an advanced motherboard, you don't have to upgrade to a slightly inferior graphics card.

Its good downward compatibility has also made many people in the industry optimistic.

In addition, Intel's PCI Express interface will include two dedicated lanes to connect to a device, for example, the PCI Express16X graphics interface that will replace AGP 8X will include its two lanes, one can be from the graphics card to the northbridge, and the other can be from the northbridge to the graphics card, each of which will have 4GB of data bandwidth, which can fully avoid the performance bottleneck caused by bandwidth.

At the same time, PCI Express also supports hot-swappable and hot-swappable features, which means that you can replace the PCI Express slot plate card and various hardware devices without having to turn off the system and power supply. From the above two points, it can be seen that PCI Express is expected to be more far-reaching in the application of servers in the future.

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The differences between the two are as follows:

1. The production background is different.

The PCI slot is based on the PCI local bus (Pedpherd Component Interconnect). PCI-Express is the latest bus and interface standard, its original name is "3gio", which was proposed by Intel, and it is clear that Intel means that it represents the next generation of IO interface standards. It was renamed "PCI-Express" after the PCI-SIG (PCI Special Interest Organization) certification was issued.

2. The working frequency is different.

The PCI bit width is 32 or 64 bits, the operating frequency is 33MHz, and the maximum data transfer rate is 133MB sec (32 bits) and 266 MB sec (64 bits). The main advantage of PCI-E is its high data transfer rate, which can reach more than 10GB S at present, and there is considerable potential for development.

3. The matching equipment is different.

PCI can plug in graphics cards, sound cards, network cards, built-in modem, built-in ADSL modem, cards, IEEE1394 cards, IDE interface cards, RAID cards, TV cards, **capture cards, and a wide variety of other expansion cards.

PCI Express is also available in a variety of form factors, from PCI Express 1X to PCI Express 16X, to meet the needs of both low-speed and high-speed devices now and for some time to come. The main ones that can support PCI Express are Intel's i915 and i925 series chipsets.