The HR-05 will fit fine on the SB, but will obstruct 1 of the sata ports if you don't have the SLi version of the HR-05.
I couldn't get the HR-05 to fit on the NB - the retaining mechanism isn't suitable. Also note that the HR-09 will not cover all the mosfets (although I don't see this as a big problem).
I decided to drop a 40mm fan on top of the NB (after cleaning and reseating). Seems to work ok.
Edit: corrected 'usb port' for 'sata port'
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