![]() Also, If you take a nice slow 4-wire PWM Noctua fan and put it on a normally functioning HP PWM header it runs way too slow. Thus, if the PWM braking is not working the fan will run at full speed just as if that 4th (PWM control signals from motherboard to rotor) wire was cut. The PWM fans HP uses are usually quite high speed ones (best bearings), and then HP applies its PWM braking from the motherboard to them. ![]() I have even piggy backed these in a few cases to increase the net resistor value applied. The kit for the Noctua I looked up for this has both a LNA and a ULNA included. check Amazon or eBay for ULNA if you want to buy them individually. I like the ULNA for much of my work on these workstations where I need such fine tuning. ![]() There are Low Noise Adapters and Ultra Low Noise Adapters, with different resistor values. You can use one of those to reduce the speed to a level you like. Many of the Noctua 3-wire fan kits ship with a voltage reducing 3.5" long 3-wire fan speed reducer, or two. One workaround is to get a nice high quality 3-wire low speed fan such as from Noctua and attach it to the first 3 pins of the 4-pin header. but not all 4 pin headers on all HP workstations vary their speeds. Most of the HP workstation chassis fans are 92 x 92 x 25 mm fans and the 4-pin headers on the motherboard have standard PWM pinout.
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