Hello spluff.
I dont know much about CPU voltages but i have a 6600k OC up to 4.4ghz and the voltage is 1.280 under load stable with sometimes get a peak of 1.296 And an "under peak" of 1.264. I dont know where u from but if its brand new in the first 15 days u can swap for a new one if its defect, lime in my country, if its the case i would do that for sure, u have a good chance of geting a good CPU sure.
Enviado do meu Nexus 5 através de Tapatalk