I don't know if this has already been noted or not, but (hell it's 41 pages of posts

), I found something about the Fury/Blizzard max clock speed.
Take a look at this:
https://github.com/dmaxl/cgminer/blob/master/driver-zeus.h#L21#define ZEUS_CLK_MAX 382 // 0xff * 3/2
So, I'm guessing that if you want to go over 382, you'd need to compile your own cgminer.
Yeap...that's right...382MHz max...

But you will need to compile / create your OWN "Zeus DRIVER", ...not the cgminer itself...

it is their custom IP...I guess...so - forget it...IMHO
ZiG