P4P800 North Bridge Cooling?

What are you guys using to cool the NB on your P4P800 when overclocking? I was installing my P4P800 tonight in my water cooled case and it appears that I wont be able to use my Danger Den Z-Chipset water block on the NB because the MB doesn't have holes in it for the mounting hardware . Any suggestions?

-Tony

I'm using the stock heatsink. I have a 80mm fan attached to a bracket that blows air over the video card and the heatsink though.

-Bobby