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Recent chipsets don't tend to need or benefit from upgraded cooling. Previously boards(LGA 775 boards) often could show benefit (higher FSB) from better cooling.
I added a 60mm fan to my chipset's heatsink and my temps improved alot. Used to idle around 54c-56c, now with the fan it hovers 38c-40c
but did it help your OC? There's no question that it helps temps, but to what ends?