special vid is only supposed to be available at vcores of 1.2v and up, below 1.2v the spec vid can add ripple which could damage the cpu.
thats all i know about it, in relation to appearing and disappearing (i don't have the board but may be getting one soon). read that at link below, post 308 and 309.
http://www.clunk.org.uk/forums/revie...review-31.html
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