From our reading, it sounds like the "screw design" was over-tightening the heatsink, to the extreme point of causing physical damage. This would explain why MSI's camera images of the PCH would ...

If I could have my way I would reduce the size of the PCH heatsink to allow for horizontal mounted stacked SATA ports, I would move the USB 3.0 header to where the SATA ports are now and I would ...

Even if you do not have LED strips, additional LEDs are embedded directly on the IO cover, PCH heatsink, ... The PCIe 3.0 lanes from the Z370 PCH remains at 24, like the Z270.

The motherboards also feature improved cooling methodology, including a larger PCH heatsink, extended heatsink on the VRMs, and heatsink on the M.2 slot to provide cooling to installed NVMe SSDs.

EK launches a new, universal hybrid water cooling kit for GIGABYTE X99 series motherboards, consisting of a MOSFET water block and a passive PCH heatsink. EK-FB KIT GA X99 LE is a value oriented ...

It's good looking, although perhaps not quite as edgy as its predecessor. However, you get a funky little status display on the PCH heatsink that can display temperature and voltage, although ...

There are RGB lighting effects around the PCH heatsink/fan and in front of the four DIMM slots. Speaking of memory, the motherboard supports up to 64GB of DDR4-3466 (OC+).