I have the "vanilla" or E758 model. There's a fan blowing away from the PCIe slots towards the CPU area. NB temps won't be a concern at all, mine right now is idling at 30C, with 70F ambient.
I finally got a good look at the NB cooler. It is pretty substantial. The heat sink itself stands tall, but rather than a fan installed on top, it's installed on the side next to the heat sink. Inside is a leaf-blower style fan that exhausts air through the heat sink.
I am going to be putting all this inside a Cooler Master HAF 932 case so there will be plenty of air flow.
Has anybody out there felt the need to replace the Northbridge cooler on the EVGA X58 SLI MOBO? If so, why? And with what?