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Can I run an MCP35x at lower voltages.... - Page 4

post #31 of 33
Quote:
Originally Posted by ooostephen View Post



Are the your other fan headers also 4pin, even though they are not actually PWM?

Correct. Same thing w/ my current Gigabyte board. All of the connections are 4-pin however only only 3/5 of them actually are able to control a fan/pump by PWM.
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Big Lian Li
(13 items)
 
Forever Alone
(8 items)
 
 
CPUMotherboardGraphicsRAM
i5-6400 @ 4.7GHz Asus Z170-A Asus GTX980 Strix 4x16GB G.Skill DDR4 @ 2800MHz 
Hard DriveHard DriveMonitorMonitor
256GB Samsung 950 Pro 480GB Mushkin Striker Asus ROG Swift PG278Q  QNIX QX2710  
KeyboardPowerCaseMouse
Topre Realforce 87U Silverstone ST1000-G Lian Li PC-A77F Mionix Naos 3200 
Other
Intel 10GbE EXPX9502AFXSR  
CPUMotherboardRAMHard Drive
Opteron 6128 Supermicro H8SGL-F Kingston Registered ECC Sandisk SSD 
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OCZ Revodrive 3 FusionIO ioXtreme Silverstone Strider 550W FT02BW 
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post #32 of 33
Thread Starter 
Holy crap, it works, kinda!
I changed the 'cpu q-fan control' to auto, and it's actually lowering the pump speeds, if only a little. I don't remember anything in the manual about this. Still the pump should be running much slower. In the 2500 range would be good. When I put a PWM fan that runs from 900-1600 on this header with the 'silent' setting, it runs at <700rpm.

post #33 of 33
Thread Starter 
Closing this out, I was never able to get good enough control from the BIOS. I learned Asus 4pin fan headers are not actually PWM, but voltage controlled. Only the CPU header is truly PWM, but its behavior is not controllable except with the presets, such as 'silent', 'turbo', etc, which were all too loud. Ultimately, I was able to get PWM control on Linux with lm-sensors. Next time I build a computer, I will have to confirm that the mobo's fan headers are in fact true PWM, and check their range. And that's assuming their support know the difference....ugh!
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