Constant fan speed with PWM fans

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zsigmondmatyas

Dec 3, 2018
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Hello, a few weeks ago I've bought a HP Compaq Elite 8100 SFF PC in which I've changed both fans (the intake and PSU fan) for Arctic F9 PWM (150-1800 RPM) fans, but they are both running at the same speed (intake - cca. 1000 RPM/PSU - 1250 RPM). I've tried stresstesting the CPU for half an hour, fan speed didn't change. In BIOS there is a Thermal option, where I can change the idle speed, it is set to the lowest (this is 1000/1200 RPM). When PC is booting for like 5-10 secs the fans run much slower (I guess around 600-800 RPM and it's much more silent). I've updated the BIOS, tried to get into an advanced menu, but didn't find that. Is there a solution for this, or what could cause the problem? This trash HP motherboard doesn't support fan control or what?

Images: https://drive.google.com/open?id=1vKWggnjVJbN1lP55BPdDR8xWHIPUT20X

Thanks for your answers!
 
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Lutfij

Lutfij

Titan
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Oct 7, 2009
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With all due respect, it's not trash. It's a prebuilt system and what you're doing to it, is beyond what any designer/engineer at Hewlett Packard could've foreseen. The prebuilt units are designed to prevent users from tampering with said units. Yo're only modifying the system beyond it's specs. In fairness you should've left it as is or rather sourced fans that are exact matches P/N wise for the ones you we're replacing.
 
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zsigmondmatyas

Dec 3, 2018
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0
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I've tried to plug back the original ADDA intake PWM fan, and the results are the same, constant speed (during heavy load too).
 
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