Should my Power Supply be making this noise when under load?



I have had a PSU exploded in my old prebuilt, It was not a fun experience. Is this issue just a noise i can ignore or is there actually a possibility of my PSU exploding.
 




I might keep it for a while and just upgrade, what psu would you recommend for my system. I am hoping to eventually upgrade to a 1080 in a year or two.