Goodnight logic board.

Goodnight heat sink.

Intel's fourth generation Core i5 processor appears to integrate the platform controller hub (PCH) right next to the CPU, a departure from the prior design's segregated chips.

The new heat sink design allows it to cover both chips, but Apple only put thermal compound on the CPU.

We won't complain too much though, as the old design left the PCH out in the hot with only the lower case as a heat sink.