For those people getting the highest 24/7 FSB numbers with quad cores, what kind of chipset voltages are you using? Pretty sure I won't get it, but making a play for 400.

Also, for this board, what is the upper limit on safe 24/7 volts for the chipset? I have good cooling for the NB.
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I couldn't get over 370 with any voltage up to 1.65v but I only worked the 10x multi for that, and that was unstable. Prime95 stable right around 350(again only testing with 10x)

Haven't read enough about max 24/7 NB voltage to answer your question properly. But seeing how the 975 is the larger technology(in comparision to the 965 for example) and the Intel datasheets I have seen posted I personally would be comfortable around 1.6 maybe 1.65 with good cooling and would be able to sleep at night with no worries. I'm sure someone will have a much better answer since people have been overclocking the 975 for a long time.