Techgage published a review of ASUS' latest X38 motherboard, which is oneof the few to feature a built-in NB waterblock.
A quote from the article:
ASUS Maximus Formula Special Edition Review
We took a look at the Blitz Formula and Extreme boards from ASUS just over two months ago, and now we have the X38 version of those boards on the bench today. In addition to featuring a Northbridge waterblock, it also has "extreme" overclocking ability and a great bundle.
ASUS Maximus Formula Special Edition Review