NM10 excessive temp on D510MO motherboard

Hi,

The D510MO has a very large passive heatsink for the Atom processor with graphics but no heatsink on the NM10 chipset. According to specs, the max dissipation for the Atom is 13 W and the NM10 is 2.1 W. Without a heatsink the NM10 gets extremely hot so we glued a copper heatsink onto it. This is drawing heat away from the NM10 since the heatsink feels warm to the touch.

Has anybody else noticed a thermal problem with the D510MO board?

Thanks.