With the motherboard sunny side up, we take a moment to pull out its brushless, 0.5 Amp fan.

Eager to get a taste of that sweet, sweet silicon, we also relieve the motherboard of its sprawling heat sink.

The cooling system in the Surface Book bears a passing resemblance to the large copper plate tucked against the battery of the Surface Pro 4, but covers silicon instead of Li-ion.

The display features a single oversized heat pipe, forming the top of a duct that uses the fan to pull heat away from the processor and major on-board components.