It's hard to tell to be honest, my hearing isn't fantastic, but as far as I can tell it is damned quiet, to the point of being inaudible when the case side is on. But it's right next to the GFX card, which is like a hovercraft, so it can be hard to tell 
Edit: Thankyou for the brownie points! I didnt realise you gave those away here

Edit: Thankyou for the brownie points! I didnt realise you gave those away here

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