Corsair CX750 makes loud noise underload

[bigbodsquad]

I just upgraded my gtx 560 ti to a 660 ti when I did the upgrade I added 2 new case fans as well for a total of 5 case fans. Now I know that the sound is not coming from the 660 ti because I accelerated the fan speed to 100% and was not making the noise I was hearing. When I had the 560 ti it never made this noise im hearing it's like a buzzing electrical type sound here is a link with the same sound I am experincing not my pc but same sound. Also at idle this sound does not occur it happens when it is under load while gaming. Is it possible that the cx750 is not powerful enough or something?

http://www.youtube.com/watch?v=eJa1uVUayEc

System Specs:
i5 2500k @ 3.30 GHZ stock speed
8 GB ddr3 RAM
Msi twin frozr 2gb 660 Ti
1 TB hard drive
After market heat sink forgot what one it was
Biostar h61mh
Corsair cx750

Please and thank you for your answers in advance it is much appreciated also how does an rma work and should i rma?

 

[Profound]

I have a the same power supply but its modular (cx750m) and a MSI GTX660 TI PE OC and ever since I got the 660ti (about 2 days ago) my pc makes a noise when on a game.

 

[gary king]

I watched your YouTube video. Did you ever resolve this issue, and how did you do it? I have a very similar problem, which I posted about here.