[rmhumphries]

Hello,

I have a brought myself a nice new Arctic Accelero Mono Plus to cool my poor ATI Radeon HD5750; which has issues with overheating. I have applied the 'thermal glue' to glue on the heatsinks, and while waiting for it to cool, have decided to pay attention to the connection of the fan.

The HD5750 itself has a 2-pin fan connector on the board, which I assume controls the fan voltage to control the fan speed. I don't know what voltage range it uses, and haven't been able to find out online.

The Mono Plus has a 4pin wire coming from the fan (Ground, VDC, Sense, PWM), and a second 3pin wire coming from the 4pin plug to a second 3pin plug (which has the first three wires only). I then have a nice handy 4pin -> Molex (8981) adapter, which I can connect either Ground and 12V to the first two pins of the fan(giving a constant 12V supply) or 5V and 12V to the first two pins (to give a constant 7V supply).

So, should I, trying to save the most energy and keep fan running as long as possible; but also fixing any overheating issues:
1) Use the Molex connector either as a 7V or 12V constant supply?
2) Try and find a 3pin -> 2pin adapter, and connect the new fan to the GPU, and let the device driver control the speed of the fan via voltage?
3) Connect to the MB 3pin fan socket, and let the motherboard control the voltage?
4) Connect the fan through a new PWM controller (help finding one would be nice)?

Lastly and on an unrelated note, how is the cooling capacity worked out for fans?

Thanks,
Robert

[Iqbal007]

(Original post by rmhumphries)
Hello,

I have a brought myself a nice new Arctic Accelero Mono Plus to cool my poor ATI Radeon HD5750; which has issues with overheating. I have applied the 'thermal glue' to glue on the heatsinks, and while waiting for it to cool, have decided to pay attention to the connection of the fan.

The HD5750 itself has a 2-pin fan connector on the board, which I assume controls the fan voltage to control the fan speed. I don't know what voltage range it uses, and haven't been able to find out online.

The Mono Plus has a 4pin wire coming from the fan (Ground, VDC, Sense, PWM), and a second 3pin wire coming from the 4pin plug to a second 3pin plug (which has the first three wires only). I then have a nice handy 4pin -> Molex (8981) adapter, which I can connect either Ground and 12V to the first two pins of the fan(giving a constant 12V supply) or 5V and 12V to the first two pins (to give a constant 7V supply).

So, should I, trying to save the most energy and keep fan running as long as possible; but also fixing any overheating issues:
1) Use the Molex connector either as a 7V or 12V constant supply?
2) Try and find a 3pin -> 2pin adapter, and connect the new fan to the GPU, and let the device driver control the speed of the fan via voltage?
3) Connect to the MB 3pin fan socket, and let the motherboard control the voltage?
4) Connect the fan through a new PWM controller (help finding one would be nice)?

Lastly and on an unrelated note, how is the cooling capacity worked out for fans?

Thanks,
Robert

Well I would use the molex as it's the easiest, but if the fan is entirely connected to the power supply and not the motherboard, than the system will run on 100% and will be noisy. So connecting it to the motherboard would be good as you can use the motherboard bios system to control the fan..............connecting it to the gpu would be better, but it'll be hard.

[Scott1541]

(Original post by rmhumphries)
Hello,

I have a brought myself a nice new Arctic Accelero Mono Plus to cool my poor ATI Radeon HD5750; which has issues with overheating. I have applied the 'thermal glue' to glue on the heatsinks, and while waiting for it to cool, have decided to pay attention to the connection of the fan.

The HD5750 itself has a 2-pin fan connector on the board, which I assume controls the fan voltage to control the fan speed. I don't know what voltage range it uses, and haven't been able to find out online.

The Mono Plus has a 4pin wire coming from the fan (Ground, VDC, Sense, PWM), and a second 3pin wire coming from the 4pin plug to a second 3pin plug (which has the first three wires only). I then have a nice handy 4pin -> Molex (8981) adapter, which I can connect either Ground and 12V to the first two pins of the fan(giving a constant 12V supply) or 5V and 12V to the first two pins (to give a constant 7V supply).

So, should I, trying to save the most energy and keep fan running as long as possible; but also fixing any overheating issues:
1) Use the Molex connector either as a 7V or 12V constant supply?
2) Try and find a 3pin -> 2pin adapter, and connect the new fan to the GPU, and let the device driver control the speed of the fan via voltage?
3) Connect to the MB 3pin fan socket, and let the motherboard control the voltage?
4) Connect the fan through a new PWM controller (help finding one would be nice)?

Lastly and on an unrelated note, how is the cooling capacity worked out for fans?

Thanks,
Robert

Did the old fan speed up and slow down with temperature increases or was it running at a constant speed?

Personally I would first try and run the fan from the 2 pin connector by chopping and reconnecting a few wires, if the fan varies speed and cools sufficiently then I would leave it like this. If the fan runs constantly at maximum speed (12v) I would try hooking it up to the molex connector as it is a bit safer than using home made cables. Then you could try 12,7 and 5 volts to find an appropriate voltage.

If you aren't comfortable cutting wires then I would just connect it to the molex connector straight away so you don't waste money on an adapter for the 2 pin connector if it doesn't work. If 12v is too loud drop to 7v, you could even go down to 5v but the fan might not move enough air at this voltage.

[rmhumphries]

(Original post by Scott1541)
Did the old fan speed up and slow down with temperature increases or was it running at a constant speed?

Personally I would first try and run the fan from the 2 pin connector by chopping and reconnecting a few wires, if the fan varies speed and cools sufficiently then I would leave it like this. If the fan runs constantly at maximum speed (12v) I would try hooking it up to the molex connector as it is a bit safer than using home made cables. Then you could try 12,7 and 5 volts to find an appropriate voltage.

If you aren't comfortable cutting wires then I would just connect it to the molex connector straight away so you don't waste money on an adapter for the 2 pin connector if it doesn't work. If 12v is too loud drop to 7v, you could even go down to 5v but the fan might not move enough air at this voltage.

It sped up and slowed down as needed due to load, so the card is certainly capable of modifying the source voltage to the fan.

While I don't mind modifying wires, then I would prefer to leave the OEM fan fully working (including its wiring), incase my other GPU's fan fails for any reason(I have 2xHD5750 in crossfire). So would need to get a 2pin cable anyway if I tried anything; which may be near the cost of an adapter (if I could find one)