Well, I've got two AK35GTR always with the thermistor too short to touch the Cpu, so the temps reported are totally untrustable (never above 35 degree C @full load with the system working 24/7)

take a look
here for more info about.
I was able to rise the FSB only up to 147Mhz rock stable, no more, even if using CorsairXMS PC2700 mem module, rated for
[email protected] and a very good cooling section, so I suppose that ABit KR7A-133-Raid is the way to go, even if can handle a VCore only up to 1.85v, so a VoltMod is required to squeeze all the juice from your chip, or consider a KT333 Mobo, ABit AT7 for example, that will be really soon released, supposed to have 1/5 & 1/6 divider
Adriano