All Neutrons have a built-in heatsink and quiet fan. The fan intake is the honeycombed hexagon next to the Neutron logo and the exhaust is on the side with the power port. This combination should keep your Neutron cool and quiet no matter what the task happens to be. With the Neutron only consuming anywhere from 10 to 30 Watts, it's not producing that much heat either!
The Neutron uses Intel's integrated HD 4400 and HD 5000 (Pro) GPUs. This should be enough to handle all but the most graphics intensive games out there. If your game is extremely graphics intensive, check and make sure it works without a discrete graphics card.