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Are VRM/MOSFET Heatsinks Essential For Unlocking?

post #1 of 5
Thread Starter 
Heya,

I know it's advised to use MOSFET heatsinks while overclocking, but what about unlocking?

I was considering picking up this board and a 555 BE and trying to unlock some cores.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157176

I know it's not the best board, but it should hold me over until Bulldozer comes out.
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post #2 of 5
MOSFET heatsinks aren't mandatory neither for OCing, nor unlocking. The thing is your board's power delivery is designed for a certain max wattage, say 125W or 140W for the most part. They must have some safety margin, say 150W. All of this is "if" you have some ventilation in the MOSFET area - you could have radiators (they help dissipate heat from the chips to the air) but you still need airflow to move the warm air away from the VRM.
If you go over the 125W limit, by OCing or unlocking (4-core CPUs consume more than 2-core CPUs) you just need to improve MOSFET cooling, by adding radiators and/or by improving airflow in that area. A low speed 60mm fan over the VRM may do much more to help than radiators.
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by dragosmp;12243835 
MOSFET heatsinks aren't mandatory neither for OCing, nor unlocking. The thing is your board's power delivery is designed for a certain max wattage, say 125W or 140W for the most part. They must have some safety margin, say 150W. All of this is "if" you have some ventilation in the MOSFET area - you could have radiators (they help dissipate heat from the chips to the air) but you still need airflow to move the warm air away from the VRM.

If you go over the 125W limit, by OCing or unlocking (4-core CPUs consume more than 2-core CPUs) you just need to improve MOSFET cooling, by adding radiators and/or by improving airflow in that area. A low speed 60mm fan over the VRM may do much more to help than radiators.

Heya, thanks.

I only planned on keeping the board for a short while until AM3+ comes out, but if I decide to keep it even after that then I would buy MOSFET heatinks and a small fan to put on it. The case it would be going in doesn't have side fans.
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post #4 of 5
Ok, then you should really have a fan to keep the heat from building up in the VRM area.
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post #5 of 5
More than. It's a 4+1 phase on a motherboard brand that's become pretty mature lately, but this motherboard was made before those days. Put them on, otherwise if you unlock or overclock you'd be on your own.
I'm not confident in those mosfets either, they are not low RDS and it looks like they cheaped out with the classic swap-MOSFET-drivers-for-third-transistors method.
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