Definitely disable CoolNQuiet. Don't know much about the SiS chipset, but my nF3-Gb has stability issues on the first two Sata ports so you might want to check that. I've looked around and the only thing I can find is that CoolNQuiet sucks on any board if you're gonna
OC. For your board, might RMA if you can. I can't find anyone else having that kinda problem. Most people say 220-230 is the max for that board so not getting past 210 might be bad luck.
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AMD 3200+ 2.2 GHz, MSI K8N NEO Platinum, 2x512 OCZ 3200 EL Plat , 2x60GB SATA (Raid 0), MSI DVD+/-RW, Koolance 300-V13, Hydor L30, Black Ice Xtreme (120mm), GF7300 GT