i wanted to ask u guys a question that i have bought 6 case fans. they have 4 pin molex connector, like a cd-rom. i wanted to ask that if i change those connectors to 3 pin one, which can be connected directly onto my motherboard. will this work fine or will i experience any problem. one more thing that my motherboard requires 8 pin connector from the psu but as i wasnt available with me, i have plugged the 4 pin one, the regular one. will i experience a problem or will it work fine. another question that will i be able to monitor the fan speed? hope to hear from u guys soon. Thanks.
You can use a three pin to connect them directly to the MB header and the fan (speed) will show up being monitored by the MB. Or you can use the 4 pin molex and run them directly from the psu. With six you can even chain connect them together from a 4 pin molex lead to the psu. You can bring a lot of fresh air into the case for the CPU fan to cool with. Use some for intake and some for exhaust to create airflow throughout the case and across the MB. 120mm are the way to go.