Gigabyte X58A-UD5 and northbridge cooling

Hi, I have searched the net for hours and couldn't find anything about the issue so asking you guys for help. I hope this is the right place for it.

My motherboard has a nice northbridge heatsink but I want to install a fan on it for overclocking, its going kinda hot when I overclock and I am worried about that. I think I don't have good airflow in my case.

Problem is I don't know if I can just install a fan on the heatsink or I need to remove the thing completely, though I think removing the pipes and all would be unwise and I really don't want to touch anything.

Here is a pic of the motherboard, as I said before cooling system looks nice and effective but I just want to install a fan on it .

Sorry if I did any mistakes, my english is not so great.

http://www.freshtechsolutions.co.uk/images/T/15431.jpg