yes, that is a northbridge cooling fan... but i have some bad news
the coolermaster fan that is in that newegg link does not have the proper mounts for your board... at least by the pics of it and of your board
most northbridge coolers (including the one on yours going bad) have 2 spring loaded clips on opposite corners to hold it on... hence you need one like it to hold it on best.
some use an adhesive tape type thermal compound, but they do not hold up...
I have this one:
Vantec Kit
If you look at the closeup pic, you'll see the holes for mounting, even tho they do not show the spring loaded pins... (you may need to re-use your old ones, removeable with a needle-nose pliers)
this kit also comes with a matching passive heatsink for the southbridge.
(and yeah, the product title says VGA cooler, but it works for both!)