Strange rattling sound when PC is doing heavy tasks.

[ScottyNitro17]

I've been having a strange rattling sound in my Custom PC I built, It's been happening for quite awhile but never bothered the PC itself, didn't freeze or slow, it's only a sound I get when doing strenuous work like Rendering a video or a HD photos on Cinema4D, playing some games makes the sound occur as well but not very often, the rattling doesn't last very long just appears when there's a very graphical render or something but strangely it's not coming from the GPU or HDD, the sound is more located to the top left corner of my Motherboard where the Motherboard heatsinks are,My motherboard is a crosshair V formula-Z (I'll add a picture below)

Once the task is over I never hear the sound again until I do another task that involves a lot of CPU,RAM,ect.

 

[kanewolf]

Maybe as the fans spin up on the radiator, the ribbon cable right next to them moves.

 

[ScottyNitro17]

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