The Corsair ones are really quiet too, even on high RPM. Though I seem to have made a mistake with the NH-D15 as it covers the first PCI-E slot, which I already knew, but what I didn't know was that I can get x16 only on it and not on any of the others, which is really dumb. I'm going to open a ticket with asus and see if this is something that will/can be addressed in the future versions of BIOS.
Though it's not really an issue as I don't think that a 560Ti can fill even an x8 lane. Whatever happens it isn't really a big deal, when I buy a new graphics card I will probably buy a new heatsink (something like a nepton 280l(even it, if it shows up on the market again)) and if asus fixes this issue then all the better for me as I will just keep the noctua.