The problem is probably not the fan, but the way the video card controls the fan.mits wrote:Yesterday I received my new Powercolor x850xt agp vivo as an upgrade to my Asus 9600XT vga. Before ordering the card I had read various reviews which mentioned the noisy cooler, but I could not imagine how noisy it was (well till now).
I have installed atitool in a try to bring the noise down at an acceptable level, but the sound level is irritated even running the fan at 5%
I swapped the stock cooler on my X800GTO which was fairly quiet with a retail P4 heatsink/fan. I was surprised to hear a grinding noise coming from the P4 fan even when using the 5% setting in ATITool. The Intel heatsink uses a nice Sanyo Denki fan and before this has always been very quiet especially when undervolted. I thought it must have just gone bad.
I built a cardboard fuct around the card and put a 92mm fan to blow air across both sides of the X800GTO and out of the back of the case. I had this fan run at ~1050rpm, but I could still hear the smaller fan grinding inside the duct.
I recently added a sound card which took up the area where the P4 fan was. Thinking I was getting rid of the noise, I removed the P4 fan from its heatsink, and reinstalled the duct and 92mm fan--hooking up this fan to the X800GTO. Unforunately, the grinding noise got louder!
The noise is evidently produced by the method the X800GTO/ATITool uses to control the GPU fan header, and it seems to be the worst at the 5% setting.
So, if you have a decent stock GPU cooler, the noise may not be the fault of its fan, and you may find your aftermarket cooler is not as quiet as it should be if plugged into your GPU fan header.
I am thinking a large capacitor in parallel with the fan might help reduce this noise by leveling out the current. Otherwise, try reducing the GPU fan voltage or just plugging the fan into something else.