OCC has published a new review of the Gigabyte EX38-DS4

The Gigabyte EX38-DS4 utilizes the X38 chipset from Intel. The motherboard features a silent cooling system with rather large heatsinks on both the PWM and the northbridge. Notice that the southbridge is not connected via a heat pipe to the northbridge but rather, it is cooled by its own heatsink. On the back of the motherboard, you'll see a copper backplate where the northbridge is. This setup allows the northbridge to dissipate heat in multiple directions.

Gigabyte EX38-DS4 Review