@Quadrum Thanks for the suggestion, I still have some Arctic MX-4 lying around at home. I'll try a new application and see if that helps. If not I'll change the cooler to a H115i
@NelizMastr I haven't de-lidded the CPU. I bought it towards the end of last year so it's still in warranty right now if it blows up. I'd rather wait until the end of this year when it's out of warranty support from Intel before I try anything like that.