Your best bet is to get some temperature monitoring software like<A HREF="http://mbm.livewiredev.com/" target="_new"> Motherboard Monitor 5.</A> Make sure you have an active internet connection when you install this program as you will probably need to download a file specifically for you motherboard. Or Asus might have some temperature monitoring software specifically for you motherboard you can use. Either way if after playing games or computer intensive tasks your CPU temperature is under 60 C, then you should be fine.
I would get the monitoring software to make sure, but if you have the two 80mm fans installed and running, then I would think that you should be alright. If you computer is unstable (i.e. random unexplained crashes during games or video encoding) then I would start to worry about getting better cooling.
Of course, I'm of the opinion you can't have too many fans, but that is just me.
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