so is it definitely the PSU then? Have you narrowed it down to that?
Yes im afraid so. Ive tested literally everything in my case, gpu fan, case fans, cpu fan, all of which are manually controlled by me apart from the gpu but the gpu fan is fine because i ramped it to lowest then up to max and it never clicked. Put my ear next to a tube, pointed at the psu and its definitely that. but it cant be the fan though. The PSU fan speed is the same but it clicks in game but not out?
Apart form the noise, is the PC running OK?
Yeah its fine.