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What does the North Bridge on the motherboard do?

post #1 of 9
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What does the Northbridge on the motherboard do? I've been questioning this for a while now, well, I know what the CPU-NB is, its just that I don't understand why we have a Northbridge on our motherboard and what purpose does it serve?

My motherboard sets the NB Voltage to 1.28volts on Auto(which I have kindly turned it down to 1.2volts and yet haven't had issues) So I've come to question why we have a Northbridge on our motherboard yet also having one on the CPU die itself?

Anyone knows this answer? Any input would be appreciated, thank you =]

& lastly, does the NB Voltage(NOT* CPU-NB Voltage) on the motherboard affects overclocking stability at all?
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post #2 of 9
May not be the most accurate answer but it makes the CPU communicate with the other parts of the motherboard.
    
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post #3 of 9
Now that the memory controller has moved to the cpu (namely cpu-nb), the motherboard northbridge holds the IGP. In my mobo, the 880G nb holds the HD4250 IGP. similarly the 890GX nb holds the HD4290 IGP.
nb voltage, if changed too much will affect system stability. So naturally it will also have impact on cpu oc. But if left at or near default value, it will not affect the job of fine-tuning cpu oc.
Edited by leopold1985 - 5/16/11 at 3:17am
    
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post #4 of 9
The northbridge is like a highway to all the components on the motherboard.... mainly the PCI slots, USB etc...
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post #5 of 9
Increasing the NB voltage can help with High HT Ref clocks and also help with ram stability when heavily OCing ram. But only in small amounts.
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post #6 of 9
Instead of telling you let me show you

x58-block-diagram.gif

block_diagram.jpg

slide02.jpg

790FX-block-diagram.jpg
Edited by Fantasy - 5/17/11 at 10:38am
    
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post #7 of 9
The Northbridge is where the information gets sent back and forth from other components, linking them together like a highway between cities. smile.gif
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post #8 of 9
this.



Ahhh.....no pic......
Edited by B NEGATIVE - 5/17/11 at 11:10am
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post #9 of 9
Yeah for the most part, on current AMD motherboards the NB houses the onboard video gpu (if any) PCIe lanes (which go to your PCIe slots) and finally the interconnect to the SB chip. The SB connects all your lower speed devices(SATA,USB etc....)

The NB of the CPU mainly corresponds to the memory controller on todays CPU's.

It used to be that the memory controller was part of the motherboard NB .. back in the day, (Pre K8 days) and for intel - (pre nehalem days).
    
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