To install the cooler on AMD's Socket AM5, you first need to prepare the pump by connecting either the all-in-one PWM cable or the separate control cable (VRM FAN / PUMP / RAD FANS have individual connectors). Once you have that sorted, plug the cable into the header on the pump. Next, remove the plastic AMD motherboard cooler brackets and install the AMD brackets using the provided screws and spacers. Keep in mind that the brackets are labeled L for left and R for right.
Next, apply thermal paste and mount the pump to the mounting brackets. Once fully secured, slide the VRM fan into place on the pump. You will know it's fully seated when it makes a noise as the magnets pull it down and keep it firmly in place.
With that out of the way, you can mount the radiator to the chassis without too much fuss, as the radiator fans come preinstalled. Once secure, route your wiring and plug everything in.
Overall, the installation is pretty straightforward on AMD with no real issues to report beyond a bit of a struggle getting the screws on the pump to grab the threaded holes in the mounting brackets. I would have appreciated a bit more thread length to make things a bit easier.
Intel Installation / Contact Frame
That said, on the Intel side, I wasn't a fan of the mounting solution, but not in the way you might think. As you can see below, Arctic has opted to use their own contact frame that replaces Intel's default retention mechanism. It also functions as the mounting bracket. While it works fine, it's not as easy to work with compared to more traditional solutions, and it's likely going to be a lot more nerve-wracking for first-time or less experienced builders. So while I have no other issues with it, it's not as appealing as easier-to-install options.
I highly recommend removing the motherboard from the chassis to prep the cooler for installation. Once the contact frame/bracket is installed, you can then reinstall the motherboard. After that, installing the cooler will be far easier, especially for those with less experience building PCs. Trying to install the contact frame when the system is already built is a bit more challenging, with Arctic suggesting the use of painter's tape to hold things in place. However, based on firsthand experience with the cooler, I can't really consider that a great option. Yes, it works, but it doesn't inspire confidence. I also have a feeling it may cause a few extra headaches and some disgruntled customers down the road. Again, all of that is avoided by using regular mounting hardware, and if a customer is worried about bending, they can buy a contact frame if they deem it necessary.