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Information, collected from different places and a little of my own experience:

Since BSOD codes arent really working in Windows 8.1 pre, I have these informations about instability to share so far:

• Lack of uncore/Ring volts = fail to load OS, hardlock/freeze doing benches and blackscreen

• Lack of VCCIN = POST fail or BSOD loading OS

• Too much VCCIN = 'lost' VGA signal.. CPU "forgets" PCIE link and needs reboot to correct

• SA voltages are dependent on what type of IC your RAM are, along with quantity of memory and total latency (enough = POST, need more = no POST)