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Cemu tacno sluzi? Kod mene u BIOS-u je postavljen manuelno na 800MHz (a moze do 1600MHZ). Aj' usput, cemu tacno sluzi i North Bridge?

Konkretno, nekidan sam uzeo AMD Athlon 64 3800+ AM2, 2x512 DDRII Kingmax 533MHz (u dual channel), MB MSI K9N NEO-F (NF 550), GF 7600 GT Gainvard PCIE 256mb 128bit, WD 160GB SATAII, 500W, DVD/RW, itd...

E sad buni me ta postavka u BIOS-u, i pitam sljedece: Zna li iko koje su optimalne postavke za ove mostove za ovu konfiguraciju (ne zelim clock), i cemu oni tacno sluze? Ako stavim auto SB padnu mi performanse za nesto malo po 3D marku 05. Tj. ako moze bezbolno (da nesto ne zajebem) da ide na 1600MHz zasto da ne...
Opet na kutiji ploce pise FSB 1000MHz.

Ima li kod nas u BL igdje uzeti onih spuzvica ili sta god za kuciste da se smanji buka, ova konfiguracija je pomalo bucna, i koliko je to dobro (mislim te spuzve)?

North Bridge
The north bridge chip, also called MCH (Memory Controller Hub) is connect directly to the CPU and has basically the following functions:

Memory controller (*)
AGP bus controller (if available)
PCI Express x16 controller (if available)
Interface for data transfer with south bridge
(*) Except for socket 754, socket 939 and socket 940 CPUs (CPUs from AMD like Athlon 64), because on these CPUs the memory controller is located in the CPU itself, not in the north bridge.

Some north bridge chips also controls PCI Express x1 lanes. On other PCI Express chipsets it is the south bridge that controls the PCI Express x1 lanes. In our explanations we will assume that the south bridge is the component in charge of controlling the PCI Express x1 lanes, but keep in mind that this can vary accordingly to the chipset model.

On Figure 3 you can see a diagram explaining the role of the north bridge in the computer.


click to enlarge
Figure 3: North bridge.

As you can see, the CPU does not directly accesses the RAM memory or the video card, it is the north bridge that accesses these devices. Because of that, the north bridge chip has an ultimate role in the computer performance. If a north bridge chip has a better memory controller than another north bridge, the performance of the whole computer will be better. That’s one explanation why you can have two motherboards targeted to the same class of processors achieving different performances.

As we mentioned, on Athlon 64 CPUs the memory controller is embedded in the CPU and that’s why there is almost no performance difference among motherboards for this platform.

Since the memory controller is in the north bridge, is this chip that limits the types and maximum amount of memory you can have in our system (on Athlon 64 it is the CPU that sets these limits).

The connection between the north bridge and the south bridge is done through a bus. At first the PCI bus was used, but later it was replaced by a dedicated bus. We will explain more about this later, since the kind of bus used on this connection can affect the computer performance.

South Bridge
The south bridge chip, also called ICH (I/O Controller Hub) is connected to the north bridge and is in charge basically of controlling I/O devices and on-board devices, like:

Hard disk drive ports (Parallel and Serial ATA ports)
USB ports
On-board audio (*)
On-board LAN (**)
PCI bus
PCI Express lanes (if available)
Real time clock (RTC)
CMOS memory
Legacy devices like interrupt controller and DMA controller
(*) If the south bridge has a built-in audio controller, it will need an external chip called codec (short for coder/decoder) to operate.

(**) If the south bridge has a built-in network controller, it will need an external chip called phy (short for physical) to operate.

The south bridge is also connected to two other chips available on the motherboard: the ROM chip, more known as BIOS, and the Super I/O chip, which is in charge of controlling legacy devices like serial ports, parallel port and floppy disk drive.

On Figure 4 you can see a diagram explaining the role of the south bridge in the computer.


click to enlarge
Figure 4: South bridge.

As you can see, while south bridge can have some influence on hard disk drive performance, this component is not so critic to performance as the north bridge. Actually, south bridge has more to do with the features your motherboard will have than with performance. It is the south bridge that sets the number (and speed) of USB ports and the number and types (regular ATA or Serial ATA) of hard disk drive ports that your motherboard has, for example.

Što se tiče klokova, pogledaj u knjižici od ploče. Ili pukni defaults u BIOSu, ne vjerujem da ploča obara klokove NB->SB. Vjerovatno je auto podešavanje ploče u redu.

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