Antec CPU cooler installs in about an hour. I would advise you to install it with the motherboard outside the case if possible. I had to install the bracket on the motherboard and then attach the cooler to the bracket with two hooks that connect to the cooler. You will need to apply significant pressure to depress the spring that the hooks attach to to secure the cooler. For me, this was the hardest part of the installation. I felt the results were worth the effort. My CPU was only air-cooled before the cooler was installed and reached over 65Β°C, now it does not rise above 40Β°C even under full load.
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