Under full load on a hot day my board's PWM gets to 46*C+, this is using a true with no real direct airflow over PWM sinks except case rear and top fans pullng air past them. Guys with quads, especially watercooled, report PWM temps over 55*C. I'm not sure what constitutes 'too hot' though.
There's no Maximus II Extreme. P45 and DDR3 is not a really good combination, they just don't clock ram very well with a nice low tRD (PL), the P45 is too weak. Add a quad into that equation and it's a poor performer. Your Rampage Extreme would be a much better platform, you should be able to get your quad to ~4.3 GHz on that board.
11*C improvement is pretty good for such a small fan. At 2700 rpm it cant be moving a lot of air.
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