Re: Chieftec GPS-550AB-A (Delta OEM)
Did another try with a washer on the SBR and this time the finding is lets say interesting. Upon having the psu without its top cover there was no hiss or pitch sound while running the pc. Once I screwed the top of the PSU it started singing again ... looked to me like some kind of AC freq noise so I put the 450W laber on the inside where the "bulk" caps-ac part is, hiss sound now is officially gone and the 12V SBR has the plastic washer that always wanted.
Did another try with a washer on the SBR and this time the finding is lets say interesting. Upon having the psu without its top cover there was no hiss or pitch sound while running the pc. Once I screwed the top of the PSU it started singing again ... looked to me like some kind of AC freq noise so I put the 450W laber on the inside where the "bulk" caps-ac part is, hiss sound now is officially gone and the 12V SBR has the plastic washer that always wanted.
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