Ditto
ive got the 8K3A+ as well, and i was concerned also as i overclock.
what i did was get a standard 40mm fan from some previous chipset cooling pack and just screw it on.
thats right, screw.
see the fan came with 4 steel screws approx 1/2 to 3/4 of an inch long, and i found that their placement in the 4 corners of the 40mm fan matched the fins of the NB passive heatsink well.
the steel screws bite inbetween the aluminium fins, leading to quite a sturdy mounted fan.
problem solved. Plus, it looks quite professional, unlike some of my previous mod jobs :lol:
so basically all you need is a stock 40mm fan that comes with 4 steel screws and you should be right.
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