Exaco

Hello guys, this is my first hi-watt PSU and first time i'm hearing this buzz sound, is this normal or potentially failing PSU? It's a brand new PSU also i tried to test with different sockets, the sound is always there when the PC is on. The sound itself is more of the type of electric box sound, it's not "aggressive" just high pitched constant noise. Here's sample ( bad mic ): https://mega.nz/#!AdRQkKhB!5doQZGAmYKNcPUB05tI8MUHX7h1phv-ikxYPncKIuRY