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Which test are you doing in Aida64, as in which boxes do you have checked?
Just installed my 4790k in my Z87x-UD4H bios was set to defaults before installing and once I got into Windows I checked the vcore with cpuz and it was reporting 1.4v when boosting to 4.4ghz - is this right?
Just finished putting mine together. Was getting similar reports of 1.27v @ stock. Dialled it down to 1.20 @4.1 for now and will refine more tomorrow. Bios update to do too.
On air for a few weeks until I sort a new loop.