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Question about VRMs

post #1 of 10
Thread Starter 



Here's a photo of my board's VRMs.

What are the gray blocks next to the VRMs with "R80" written on them? Are they part of the power circuitry?

Also, why does my board only have a heatsink over half of the VRMs? Does the other half not get as hot?
Edited by 996gt2 - 6/9/11 at 6:04pm
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post #2 of 10
The gray blocks are chokes.
Yes they are a crucial part of the power circuitry.
No Idea why they didnt heatsink the entire VRM series.
    
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post #3 of 10
The heatsink covers the regulators that get the heaviest part of the charge first. Still, they should have covered it entirely.
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by aerieth View Post
The heatsink covers the regulators that get the heaviest part of the charge first. Still, they should have covered it entirely.
Would it be beneficial to put heatsinks on the rest of the VRMs with thermal tape if I'm overclocked pretty heavily? Alternatively, would a small fan blowing at the VRMs help? I have a large cooler (NH-D14) and it doesn't really blow any air towards the VRMs due to the reversed airflow in my Lian Li PC-A05 case
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post #5 of 10
[QUOTE=MR KROGOTH;13815608
No Idea why they didnt heatsink the entire VRM series.[/QUOTE]

lower series motherboards don't have it.
    
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post #6 of 10
A fan would be a better deal than thermal tape. But you really don't have to worry about them like that, they do not create huge amounts of heat.
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post #7 of 10
You could go get some small mosfet sinks for them, a bit ugly but it gets the job done.
post #8 of 10
the heatsink sits on low RDS(ON) MOSFETs they convert 12v to whatever output voltage teh CPU needs, then they output the the inductors(chokes) which are part of the low pass filter which is made up of the chokes and the capacitors. The low pass filter is there to store the output from the FETs, as the FETs are not on at the same time they are on for how every much the switching frequency and duty cycle say, anyways they store the energy in those cubes and then output the the capacitors which store the energy as well but also reduce ripple and then output to your CPU.

Its called a low pass filter because the PWM sends the switching frequency and duty cycle signals out to the drivers which then switch on the MOSFETs for however long the PWm thinks they should be one, and then one by one they discharge current into the inductors which turn on/off current into a steady output current, which then goes to the capacitors which clean up the current and then discharge to the CPU and the cycle starts all over again. In the case of your board every pair of high and low side MOSFETs is controlled by another MOSFET working as a driver really.

if you check your BIOS you should have switching frequency control under a %. Higher percentage = higher switching frequency = less ripple, less over/under shoot, but hotter MOSFETs. If you have this control, set it to 33%.
Edited by Sin0822 - 6/9/11 at 10:40pm
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Sin0822 View Post
the heatsink sits on low RDS(ON) MOSFETs they convert 12v to whatever output voltage teh CPU needs, then they output the the inductors(chokes) which are part of the low pass filter which is made up of the chokes and the capacitors. The low pass filter is there to store the output from the FETs, as the FETs are not on at the same time they are on for how every much the switching frequency and duty cycle say, anyways they store the energy in those cubes and then output the the capacitors which store the energy as well but also reduce ripple and then output to your CPU.

Its called a low pass filter because the PWM sends the switching frequency and duty cycle signals out to the drivers which then switch on the MOSFETs for however long the PWm thinks they should be one, and then one by one they discharge current into the inductors which turn on/off current into a steady output current, which then goes to the capacitors which clean up the current and then discharge to the CPU and the cycle starts all over again. In the case of your board every pair of high and low side MOSFETs is controlled by another MOSFET working as a driver really.

if you check your BIOS you should have switching frequency control under a %. Higher percentage = higher switching frequency = less ripple, less over/under shoot, but hotter MOSFETs. If you have this control, set it to 33%.
I don't think the UD3 has this control.
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post #10 of 10
that is interesting b/c my UD3H indeed does. I think it's because yours is P67, the Z68 boards event he low end use Driver MOSFETs instead of low RSD (on) MOSFETs, which would allow more user control.


Honestly don't bother with a heatsink, there would have been one there if it was needed. But if you wan there are some small blue zalman heatsinks that might look nice.
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