What cpu and are you overclocking it? If dual core or above and you are wanting to keep it as quiet as possible, then you are going to want atleast a 220 radiator. That way you can have low rpm fans and still have optimal cooling. With a 120 you are going to need a mid to high rpm fan to have adequate cooling. If it is a single core then a 120 radiator will be fine. On choosing radiators, make sure you don't pick one with too dense of fins. It eliminates you from using low rpm fans. I just learned that leason myself this week. I had purchased a slimline dense radiator that the company says was optimized for low rpm fans. All I have to say is, I would hate to see what their products are like that are not optimized for low rpm fans. To make this radiator work I had to go with 38mm thick fans.
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