![]() ![]() ![]() On my PII 965 in the gaming rig, the motherboard will ramp up the fan to around 2800 by 55 degrees, 4000rpms by 58-59 degrees, and upto 6990 rpms by the time I get to 62 degrees on a very hot day. Thubans are safe for temps upto 62 degrees or so, and your motherboard will adjust the fan speed accordingly. Under stable system loads, the software then automatically lowers fan speed to the optimal setting, decreasing fan noise without compromising performance. I would leave your motherboard's onboard cpu fan controller alone to work by itself as it should do a decent job as long as you don't turn it off. AI Cooling detects CPU temperatures and uses a proprietary algorithm to calculate the lowest fan speed required to effectively cool the system and keep fan noise down. I would also imagine that it could decrease the life of the fan, although the fan was designed to spin upto those speeds and shouldn't be damaged. I can't imagine why you would want to run your fans at high speeds all the time as it is loud enough to be uncomfortable. The stock PII cooler maxes out at upto 7000rpms, and you'll know it when it gets that high as it gives new meaning to a "dust buster." It is ear piercing deafening loud. ![]() The control input is usually an open-drain or open-collector output with a 5 V or 3.3 V pull-up. That Thuban is just waiting for you to crank up the clocks on it, but you need a very good air cooler first. The PWM signal is the control input of the PWM fan. As others say, I recommend that you go out and get a decent air cooler. ![]()
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