function of southbridge

Northbridge is also called MCH, memory controller hub, or IMC, integrated memory controller, in Intel systems, AMD, VIA, SiS and other motherboard.

However, the GMCH, Graphics and AGP Memory Hub, the equivalent of the Northbridge, doesn't handle the PCI bus.

Change ), You are commenting using your Twitter account. The Northbridge is a controller chip used to deal with the interaction among the CPU, RAM, the L2 or Level 2 cache, BIOS ROM, and PCI Express, and the AGP, Accelerated Graphics Port, which are the components that benefit most from fast communication with the processor. The faster the communication faster will be the data processing. In many modern chipsets, the southbridge contains some on-chip integrated peripherals, such as Ethernet, USB, and audio devices. The other is the Northbridge. The Northbridge is a controller chip used to deal with the interaction among the CPU, RAM, the L2 or Level 2 cache, BIOS ROM, and PCI Express, and the AGP, Accelerated Graphics Port, which are the components that benefit most from fast communication with the processor. The overall trend in processor design has been to integrate more functions into fewer components, which decreases overall motherboard cost and improves performance.

Integrated hardware can include the sound card and video card if on the motherboard, USB, PCI, ISA, IDE, BIOS, andEthernet. A particular southbridge will often work with several different northbridges, but these two chips must work together. However, the GMCH, Graphics and AGP Memory Hub, the equivalent of the Northbridge, doesn't handle the PCI bus. It uses the FSB, fast Front Side Bus, to link the various components.

It is common separate the chipset into the northbridge and southbridge, although there are rare instances where these two chips have been combined onto one die when design complexity and fabrication processes permit it.


These are communication bridges between the CPU and the peripherals connected to it. The southbridge gets its name for commonly being South of the PCI bus. Learn different types of networks, concepts, architecture and... Read More », Learn about each of the five generations of computers and major technology developments that have led to the computing devices that we use... Read More », Software-Defined Data Center (SSDC) Definition, Software-Defined Storage (SDS) Definition & Meaning, Your PC's Second Most Important Silicon: The Chipset. Northbridge is connected directly to the CPU via the front-side bus (FSB) and is thus responsible for tasks that require the highest performance. Northbridge and Southbridge are chipsets used to handle communications functions on most PC type motherboards. Another important factor is that the IHA bus can detect different data types as they move over the bus and optimize its bus performance.

In other words, all of the functions of a …

The northbridge links the CPU to very high-speed devices, especially RAM and graphics controllers, and the southbridge connects to lower-speed peripheral buses (such as PCI or ISA). The northbridge plays an important part in how far a computer can be overclocked, as its frequency is commonly used as a baseline for the CPU to establish its own operating frequency.
Through the use of controller integrated channel circuitry, the northbridge can directly link signals from the I/O units to the CPU for data control and access.

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The southbridge, also called ICH, I/O controller hub, in Intel systems, AMD, VIA, SiS and other motherboard, is a chip used to implement the "slower" capabilities of the motherboard in a northbridge/southbridge chipset computer architecture.



They determine how fast your CPU will communicate with the motherboard.

In systems with Intel chipsets, the southbridge is named I/O Controller Hub (ICH), while AMD has named its southbridge Fusion Controller Hub (FCH) since the introduction of its FusionAMD Accelerated Processing Unit (APU). Includes Top... Read More », Have you heard about a computer certification program but can't figure out if it's right for you?

The northbridge links the CPU to very high-speed devices, especially RAM and graphics controllers, and the southbridge connects to lower-speed peripheral buses (such as PCI or ISA). You will find them on almost all current computers like Intel chipsets, VIA, and AMD chipsets. These help CPU to communicate to the Memory and the I/O Ports.

we should first talk about what they are and their present importance. Traditionally this interface between northbridge and southbridge was simply the PCI bus, but since this created a performance bottleneck, most current chipsets use a different interface with higher performance. The Northbridge-Southbridge chips greatly increase the speed of modern computers. The computers using Intel's new IHA, Intel Hub Architecture are exceptions.

Because different processors and RAM require different signalling, a northbridge will mainly work with only one or two classes of CPUs and only one type of RAM in general. ( Log Out / 

It’s basic functionality is to control the PCI Bus, ISA or LPC Bridge, SPI Bus, SMBus, DMA Controller, Mass Storage, Real-time Clock, BIOS, Audio. The Southbridge is attached to the Northbridge's PCI bus. That is now handled by the ICH, I/O Controller Hub, which sits on a bus and is two times faster than the Southbridge's bus.

The Northbridge can consist of more than one discrete chips while the Southbridge is typically only one discrete chip that rests on the Northbridge��s PCI bus.

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The northbridge is important for how far a computer can be overclocked, as its frequency is used as a baseline for the CPU to establish its own operating frequency.

The southbridge is not directly connected to the CPU, which is different from that of the northbridge and the northbridge ties the southbridge to the CPU. The southbridge typically implements the slower capabilities of the motherboard in a northbridge/southbridge chipset computer architecture. Through the use of controller integrated channel circuitry, the northbridge can directly link signals from the I/O units to the CPU for data control and access. CPUs cannot be overclocked infinitely, as digital circuits are limited by physical factors such as propagation delay which increases with operating temperature, therefore most overclocking applications have software limitations which limit the multiplier and external clock setting. There is no industry-wide standard for interoperability between different core logic chipset designs. These are collectively known as Chip sets.

One of the advantages of having the memory controller integrated on the CPU die is to reduce latency from the CPU to memory.

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