I'm trying to get a new fan for my old Acer Aspire X3200 since the stock one sounds like a commercial jet. The fan is an Everflow F129025SU, specs here. I'm trying to get one under 30 dB but I see that the current fan has an airflow of 74.55 CFM (side note: also 90mm) probably because of the slim case. I want to get a quiet fan but I'm afraid that one that quiet might not cool well enough. Any advice?