I noticed that in msinfo32 my BIOS mode is legacy, could it be because my other GPU does only have legacy mode? See this image.
http://imgur.com/a/yIFPP
I think you just got bad chip, i have 4670k too and all i did was sync all cores, multiplier and core voltage, i got bad too, 4.3GHz with 1.22v cant get 4.4ghz until 1.3v
my vcore is 1.7v according to hwmonitor but cpu voltage i tweak in bios is shown as vid in hwmonitor?
http://imgur.com/lRcvNHl
anyway how long should i run prime95 ? will single run at intel burn test do it? and of course some gaming