If you on aircooling or have any air flowing towards the NB you shouldn't need to change it. So long as your running 1:1 most boards seem reach 500FSB @default nb voltage. Mine will do 505 @ 1.24v 32mb pi stable. I'm hooking up my Ultra ChillTEC CPU Cooler today so I hope to find the 1:1 limits of my board & cpu.
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