The MXC370-0A looks like an MCX462 that's spent too much time in the hot shower. However, its base plate is made from aluminum instead of copper.
The lapped underside of the plate ensures minimal heat transmission resistance.
Corrugated, pressed-in aluminum pins make up the cooling surface. The MCAX370 is not connected to the motherboard, but to the power supply unit. The fan does not offer a speed signal, which is why motherboards that read the speed signal of the CPU connector (fan connection) won't boot up in the first place.
When it comes to cooling capacity, the 370 has no reason to hide behind its brother.
The fastening mechanism of the MCX370-0A is not standard cooler fare. It's not a spring that keeps the fan in place, but a safety clip on either side. The cooler's pressure on the die is regulated with a screw on the clip. The installation instructions that come with the cooler will take you through the installation step by step if you're not sure.