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Some progress: I'm able to fake the CPU fans to be detected by using an Arduino and writing a 50% duty cycle 25Hz PWM signal to the TACH pin (pin 3) on the motherboard CPU fan connector. The code for doing this is simply: -code- int pwmPin = 3; // e.g. void setup() { setPwmFrequency(3...

Any idea what pin is what in the memory fan connector? EDIT: Ah found it https://support.hp.com/ee-en/document/c01726577

I did some testing with my HP Z600 using an Akasa fan splitter. Findings: It's possible to connect two fans to one 5-pin port. I don't know yet if the voltage is halved or something, but it works. The BIOS will boot without the F1 error, even with two fans running in the same bus. However...

Have you made any progress? I'm looking to do the same with a Z600 and I was wondering what could be the best way to approach this. Things I've thought so far: 1) Simply exchanging the fans. -Probably not going to work out very well, because of the BIOS check on fans. Potentially only fans...

So do you use the Z600 with custom fans? This is not directly related to x86, but I'm also doing a Hackintosh out of a Z600, but I'm also trying to switch the fans to more silent ones. Problem is that the computer checks that the fans match to some specifications and refuses to boot, if the...