I have no room for a reservoir inside the case, so I use a pump, WB, & Swiftech radiator that has a built in reservoir mounted to the outside of the case. The radiator in kit form would use an 82 CFM fan. Swiftech claims best performance when using a slow to medium speed fan. I'm taking a guess that the 82 CFM is what they consider a medium speed fan. I'd like to add fans to the radiator in that flow range, 120 x 3/8", but how far over can I go before I hurt cooling performance? The reason for the question is that the price of fans is all over the place. What CFM would be a waste? I'm not looking to mount 250 CFM fans, but the reasonably priced ones I found flow 110+ CFM. Is that going to be outside the operating range of the radiator? They run $8.99 a piece.