Just get 5mm 100*100mm thermal pad on ebay, for about $7 and slap it on the back of the board. This will transfer some of the heat to the case. One pad is enough for two units. You can find details on freaktab forum.
Didn't bother with heat sinks on the CPU since the difference was reported negligible.
BTW, don't see the point of dual boot on those new X7, it will just eat more storage space