Hi,
I have a HP dc5700 which I am modding to a little quieter as it is my file/media server. I have already put in an Antec Phantom 500 and am following it up by replacing the two 92mm fans with Noctua NF-B9's.
The problem I have is with the Fan Headers on the Motherboard. The dc5700 has one Fan Header for the CPU and two Fan Headers for Chassis Fans. The system only comes with one Chassis Fan so I am sticking with one CPU and one Chassis Fan.
All Fan headers on the Motherboard are 4 Pin but only the CPU Header allows a 3 Pin Fan Connector to be used. I will attempt to illustrate the difference.
CPU
.
.|
.|
.|
Chassis
.|
.|
.|
.|
As you can hopefully see, the CPU Fan Headers plastic edge is shorter than the length of the 4 pins to allow a 3 Pin Fan Connector to be used.
So the Noctua fans as I'm sure you have already gathered use 3 Pin Fan Connectors which meant I had to connect the Chassis Fan using the Molex adapter provided in the Fans box. This would all have been lovely except the dc5700 BIOS displays a POST error if no Chassis Fan is detected forcing the user to press F1 to continue booting. Doh!
I can see three ways around this problem.
1.
Trick the Motherboard into thinking there is a fan connected to one of the Chassis Fan Headers and leave the Chassis Fan connected via the Molex adapter. I couldn't find any such information on whether this is even possible yet alone if a product exists.
2.
Make use of an adapter to allow a 3 Pin Fan Connector to connect to a 4 Pin Fan Header whose alignment edge is longer than you would normally find on a CPU Fan Header. Searches for such a product proved fruitless as I kept on finding Molex adapters.
3.
Borrow the 4 Pin Fan Connector from the removed fan and connect it to the Noctua Chassis Fan. I'm sure this is possible but I wouldn't want to connect the wrong wires and either spin the fan the wrong way or "blow" the circuits.
I am hoping all that makes sense but hoping more someone has a solution!
Thanks in advance for any assistance
Blowfish_uk
![Hello :hello: :hello:](/data/assets/smilies/hello.gif)
I have a HP dc5700 which I am modding to a little quieter as it is my file/media server. I have already put in an Antec Phantom 500 and am following it up by replacing the two 92mm fans with Noctua NF-B9's.
The problem I have is with the Fan Headers on the Motherboard. The dc5700 has one Fan Header for the CPU and two Fan Headers for Chassis Fans. The system only comes with one Chassis Fan so I am sticking with one CPU and one Chassis Fan.
All Fan headers on the Motherboard are 4 Pin but only the CPU Header allows a 3 Pin Fan Connector to be used. I will attempt to illustrate the difference.
CPU
.
.|
.|
.|
Chassis
.|
.|
.|
.|
As you can hopefully see, the CPU Fan Headers plastic edge is shorter than the length of the 4 pins to allow a 3 Pin Fan Connector to be used.
So the Noctua fans as I'm sure you have already gathered use 3 Pin Fan Connectors which meant I had to connect the Chassis Fan using the Molex adapter provided in the Fans box. This would all have been lovely except the dc5700 BIOS displays a POST error if no Chassis Fan is detected forcing the user to press F1 to continue booting. Doh!
I can see three ways around this problem.
1.
Trick the Motherboard into thinking there is a fan connected to one of the Chassis Fan Headers and leave the Chassis Fan connected via the Molex adapter. I couldn't find any such information on whether this is even possible yet alone if a product exists.
2.
Make use of an adapter to allow a 3 Pin Fan Connector to connect to a 4 Pin Fan Header whose alignment edge is longer than you would normally find on a CPU Fan Header. Searches for such a product proved fruitless as I kept on finding Molex adapters.
3.
Borrow the 4 Pin Fan Connector from the removed fan and connect it to the Noctua Chassis Fan. I'm sure this is possible but I wouldn't want to connect the wrong wires and either spin the fan the wrong way or "blow" the circuits.
I am hoping all that makes sense but hoping more someone has a solution!
Thanks in advance for any assistance
Blowfish_uk