Motherboard is Intel D865GBF board (socket 478), 2.4 GHz processor, stock heatsink (Copper cylinder + Aluminium fins) and fan.
CPU fan specs: C91249-002, DC 12V, 0.13A, 70 mm (2.75 inch), NIDEC corp
Fan connector current capability from D865GBF board technical product specifications manual:
Fan Connector Max Available Current
-----------------------------------------
Processor fan - 1600 mA
Front chassis fan - 800 mA
Rear chassis fan - 800 mA
I have two 120 mm (case) fans with 3-pin as well as regular molex connectors.
1) Deepcool XFAN 120 : 12 V DC, 0.07 +/-10% A (0.84W), 1300 +/-10% RPM, 65.16 CFM, hydro bearing
2) Deepcool UF 120 : 12 V DC, 0.13 +/-10% A (1.56W), 500 +/-200 to 1500 +/- 10% RPM, 74.34 CFM, ball bearing
I wish to remove the CPU fan and replace it with one of the two 120 mm fans above.
Can I connect either of the 120 mm fans to the 3-pin CPU connector? The current rating for both 120 mm fans are within limit. But, I am concerned about the RPMs. The 120 mm fans have max RPM of 1300 and 1500. The CPU fan RPM vary between 2500 and 3200. If the CPU fan control circuit senses the (120 mm) fan is not going past 1300/1500 RPM, will it shut down the system?
I don't know how the fan control circuits work. Given the higher airflow of the 120 mm fans, cooling should not be a problem and temperature should be similar to or lower than those with the original CPU fan. But, if the fan control circuit relies on RPM inspite of the temperature being within the max permissible limit (69 deg C), it may cause unpredictable behaviour. Can anyone shed more light on this please?
Also, what would happen if I do not connect any fan to the CPU connector? Instead, I connect the 120 mm fan directly to a PSU molex connector and have it run at full speed (12 V DC) blowing air on the heatsink. Will it work?
Thanks in advance.
CPU fan specs: C91249-002, DC 12V, 0.13A, 70 mm (2.75 inch), NIDEC corp
Fan connector current capability from D865GBF board technical product specifications manual:
Fan Connector Max Available Current
-----------------------------------------
Processor fan - 1600 mA
Front chassis fan - 800 mA
Rear chassis fan - 800 mA
I have two 120 mm (case) fans with 3-pin as well as regular molex connectors.
1) Deepcool XFAN 120 : 12 V DC, 0.07 +/-10% A (0.84W), 1300 +/-10% RPM, 65.16 CFM, hydro bearing
2) Deepcool UF 120 : 12 V DC, 0.13 +/-10% A (1.56W), 500 +/-200 to 1500 +/- 10% RPM, 74.34 CFM, ball bearing
I wish to remove the CPU fan and replace it with one of the two 120 mm fans above.
Can I connect either of the 120 mm fans to the 3-pin CPU connector? The current rating for both 120 mm fans are within limit. But, I am concerned about the RPMs. The 120 mm fans have max RPM of 1300 and 1500. The CPU fan RPM vary between 2500 and 3200. If the CPU fan control circuit senses the (120 mm) fan is not going past 1300/1500 RPM, will it shut down the system?
I don't know how the fan control circuits work. Given the higher airflow of the 120 mm fans, cooling should not be a problem and temperature should be similar to or lower than those with the original CPU fan. But, if the fan control circuit relies on RPM inspite of the temperature being within the max permissible limit (69 deg C), it may cause unpredictable behaviour. Can anyone shed more light on this please?
Also, what would happen if I do not connect any fan to the CPU connector? Instead, I connect the 120 mm fan directly to a PSU molex connector and have it run at full speed (12 V DC) blowing air on the heatsink. Will it work?
Thanks in advance.
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