Another option is the NZXT Kraken-120  which was just successfully installed by another Alien on their Aurora R10 (same chassis as R12). If you are currently air cooled, you will also need the VRM heatsink once you go with liquid cooling. Also, whatever CPU cooler is currently installed will have thermal paste applied . . . and require cleaning.
Hello, I have an Alienware Aurora R12, and wanted to get into water cooling. The reason is, I'm getting a new RTX 3080 ti  (one that fits) and obviously; This will cause my CPU to get very hot as well as my PC. I've been advised to switch to water cooling, but I don't know where to get started. Would anyone mind helping guide me into this process? Please and thank you. Here are my specs: Ram:  32 gigs (4 slots x 8 gigs) Graphics card: RTX 3080 TI PSU: 850 watts (Fully modular) CPU: 11th Gen Intel Core i5 11400F (6-Core, 12MB Cache, 2.6Ghz to 4.4GHz) If you have any questions, I will be answering.
Aurora R12, should I switch to water cooling?