@MattH
Where did you get the (AFAIK incorrect) information that your CPU is meant to run at 1.64?
DO NOT raise it, because it is not meant to run at 1.64, it's meant to run at 1.6V, so 1.59V is fine.
Your CPU fan is probably inadequate though (I bet you have the "Sunon" cooler).
Regards.
