If there's one thing I can't stand on motherboards as of late -- it's the proliferation of these vestigial fans on the northbridge heatsinks. A manufacturer puts some cheap low profile, small surface area heatsink on the northbridge, then slaps on a high RPM noisy fan that goes bad after six months and gets noisier in the process . . . . when all the northbridge needed in the first place was a decent heatsink without the added moving parts of a fan. I'm glad Asus at least get this right. Buying Asus lately reduces the cost of ownership for me, as I always modify my northbridge to passive cooling, so getting it that way by default is super fine. What's more, the presence or non-presence of a fan on the northbridge heatsink doesn't seem to be a large factor in how far people can overclock. For most people, most of the time -- the overclocking bottleneck lies elsewhere than the temperature of the northbridge.
/digress