Thanks ken-Intel for your helpful advice and encouragement. I have unmarked your previous as correct answer and instead marked the post with the link as correct so people can find the document easily, which is a useful resource for people trying to set up an I7 4790K system so thanks, I am sure people appreciate the effort you have gone to to provide that.
In other news I have sent a question to Gigabyte about the higher than normal BIOS power limiter settings with the GA Z97MX Gaming5 and will relay any reply here when I get one.