None of them are within OEM range. For example, some of them reduces air flow by almost 4. You need 25 cfm. 7 or 8 is definetly too low. Also, OEM fan is 28 mm thick. I'm not sure 20 mm thick will work. Power draw is around 6.5 watt. @ around 2 watt, do not expect a fan to do the same job. Noise level is the parameter you should check last. Not first. In order you need to check this: Size: 40 x 40 x 28 Watt: 6.5 Airflow: 25 CFM Feedback: PWM, 4 wires Life: OEM is 70,000 hours (low and chinese cheap), good ones are above 100,000. You are far more sensitive than I to find 51 db is very noisy. Paul Jr
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