I bought a new server rackmount a year ago, and never bothered to do my math. The case has 2x 80 mm fans in the rear, and so I purchased a dual 80mm rad. My mistake was that the clearance added by the top/bottom of the radiator made it logistically impossible to mount. Infact a 120 is the only rad that I can mount without a severe case mod, which I do not want. Ive gotten sick of it just literally tucked in the top of my case (Out dated motherboard, but same setup), so I decided to find a 120 single which SHOULD fit right up to the fan in the front of my case. This would be optimal because It would then look like it belonged, and give me an option to move my case or change the layout. My math keeps telling me that a single 120mm rad will have more total surface area than an dual 80mm...not by much, but a bit more...so to me a 120 solves more problems than it creates. Also, I was eyeballing his 120mm heater core and shroud...would this cool better than one of the "High performance radiators", because honestly I would feel quite comfortable bending copper tubing and soldering it right in place all the way up to the pump and cpu block. All I will be cooling is my cpu, and It craps out at 4.0ish, so heat is not terribly concerning. Ill clock based on heat. Thanks in advance for the advice.