1st of all, stop using 1:1.25 FSB to memory ratio...use 1:1 until you find a suitable, stable overclock for yourself...once everything is soild, you can start playing around with the memory straps...1:1 and 1:1.2 are the 1333 mhz straps...those should give you the highest FSB based on the installed hardware, mobo, set voltages and installed cooling.
PWM:
http://en.wikipedia.org/wiki/Pulse-width_modulation
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