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What part of a mobo is this?

post #1 of 11
Thread Starter 
http://www.build-your-own-computer.n...d-diagram.html
Letter D, i know that it's a northbridge, but is that thing on the mobo the actual northbridge itself or is it a cover to protect the actual chip, becaues the southbridge is just a chip it looks like
post #2 of 11
'Tis a heatsink.
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post #3 of 11
Thread Starter 
Ok that's what I thought, but was wondering why does a NB need one and not a SB? Because the NB handles more demanding things like ram and the cpu and SB uses things like onboard audio and usb, etc?
post #4 of 11
Quote:
Originally Posted by venomblade View Post
Ok that's what I thought, but was wondering why does a NB need one and not a SB? Because the NB handles more demanding things like ram and the cpu and SB uses things like onboard audio and usb, etc?
On relatively modern motherboards heatsinks on both are needed. In the Asus P5E in the article you liked to, there is indeed a heatsink on the SB. But what Asus did was network and interconnect thermal plates to remote baffles by heatpipes.

In that specific board, the Southbridge and one of the MOSFET arrays share baffles. Just as the northbridge and the other MOSFET array share a baffle.
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post #5 of 11
Quote:
Originally Posted by Skripka View Post
'Tis a heatsink.
This.
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by Skripka View Post
On relatively modern motherboards heatsinks on both are needed. In the Asus P5E in the article you liked to, there is indeed a heatsink on the SB. But what Asus did was network and interconnect thermal plates to remote baffles by heatpipes.

In that specific board, the Southbridge and one of the MOSFET arrays share baffles. Just as the northbridge and the other MOSFET array share a baffle.
Well if i had to ask what a heatsink was, I definitely need to ask what a mosfet is( already googled it) but don't fully understand why it's prefered.
post #7 of 11
Quote:
Originally Posted by venomblade View Post
Well if i had to ask what a heatsink was, I definitely need to ask what a mosfet is( already googled it) but don't fully understand why it's prefered.
MOSFETs are basically power gates that take 12V power off the PSU and turn it into well-regulated power @~1V for the CPU to use. There's a big old wiki article on MOSFETs and MOSFET theory.

Heatsinks do just what the name says. They dump heat away from something into something else, say from a computer chip into the air. Simplest way is passively by massively increasing the surface area of the chip and letting air drift over....or relying on case fans to move air through them.
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post #8 of 11
Quote:
Originally Posted by venomblade View Post
Well if i had to ask what a heatsink was, I definitely need to ask what a mosfet is( already googled it) but don't fully understand why it's prefered.
Why what's preferred? Putting heatsinks/heatpipes on the NB/SB? They put out heat and can become unstable if they get too hot. MOSFETS have a tendency to get quite warm as well, especially when stressed by overclocking.
    
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post #9 of 11
Thread Starter 
Ah i see, so does that mean using mosfets allows for greater OC'ing?
post #10 of 11
Quote:
Originally Posted by venomblade View Post
Ah i see, so does that mean using mosfets allows for greater OC'ing?
All motherboards have MOSFETs. But running higher power CPUs ( or any CPU at high OCs) requires more power...which requires either higher quality MOSFETs, or more MOSFETs.

With high-power CPUs you want the MOSFETs heatsinked. Why? MOSFETs are transistors and are prone to thermal runaway. Transforming power generates heat, which needs sinked...when it doesn't the MOSFET gets hotter...which causes the MOSFET to become unstable in current output...which causes the MOSFET to get hotter. In an unending cycle til bad things happen.

A great real life example of poor MOSFET design and thermal runaway are the masses of MSI AMD motherboards that have cheap MOSFETs...that are known for exploding with high power CPUs. You don't want a firecracker in your case.
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