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Z97 Classified PWM issues

post #1 of 7
Thread Starter 
Hello, I'm having an issue with my fan hub not getting a PWM from the CPU or CPU OPT headers, aswell as the 2 4pin Chassis headers behind the IO cover.
Ive tried 2 fan hubs, a phobia 8 way fan hub and now a SilverStone 1-to-8 PWM Fan Hub. All fans are 4pin PWM Corsair SP120's. I've set the hubs up correctly and have tried everything I can to control them via the UEFI, also I've tested each fan header with a single fan( 4pin), and they're all good.
My only conclusion is that the fan headers aren't actually putting out a true PWM signal, instead they are just DC controlled.
I just need to know if anyone has run into this problem with the Z97 Classified, and if how they fixed it.

My only idea is to run 4 fans of each CPU header and speed control them that way, but the headers only have 1 amp each and 4 SP120's on each will use exactly that.
Should I be worried about the headers dying?
post #2 of 7
Most boards will allow you to specify the pin count on the fans/controllers you are connecting to each header. Have you made sure this isn't the problem?

Also, you're a little off on your amp calculations.

http://www.corsair.com/en-us/air-series-sp120-high-performance-edition-high-static-pressure-120mm-fan

4 fans should use .72 amps at max draw.
Edited by WizardontheJob - 11/10/15 at 5:32am
Jarvis
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Jarvis
(26 items)
 
Pepto Pony
(12 items)
 
MrDVR
(15 items)
 
CPUMotherboardGraphicsGraphics
AMD Ryzen 5 1600X CROSSHAIR VI Hero MSI GTX 980 Gaming 4g MSI GTX 980 Gaming 4g 
RAMHard DriveHard DriveHard Drive
G.SKILL Ripjaws V Series 16GB 2x2 Samsung 850 EVO 250Gb SSD Intel 160 Gb SSD Intel 250 Gb SSD 
Optical DriveCoolingCoolingCooling
Generic DVD-RW 2 x Noctua (NF-P12-1300 )1300rpm Premium Silent... Monsoon 90° Rotary Angle Fitting - 5/8" - Red Bitspower Dual / Single D5 Top Upgrade Kit 100 ... 
CoolingCoolingCoolingCooling
ModMyToys DreamFlex Premium 3/8" ID Tubing Reta... Coolance Liquid Coolant Bottle, 700mL Fluoresce... Coolance PMP 450 Variable Speed D5 Pump Bitspower D5 Mod Top V2 Pom version 
CoolingCoolingCoolingCooling
Alphacool NexXxos UT60 Full Copper Radiator 240 Noctua NF-A6X25 FLX Quiet Computer Cooling Fan ... NZXT Sentry Mesh Fan Controller w/ Five 30 watt... 2 x Corsair Air Series SP120  
CoolingOSMonitorKeyboard
COUGAR CF-V12H Vortex Hydro-Dynamic-Bearing  Microsoft Windows 10 Professional Samsung KS8000 4k UHD 65" Microsoft Wireless Comfort 5000 Keyboard and Mouse 
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Corsair SSD Samsung 7200 Laptop drive Some DVD Burner I took out of a dead Dell. Noctua NH-C12P SE14 
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post #3 of 7
Quote:
Originally Posted by merceless View Post

Hello, I'm having an issue with my fan hub not getting a PWM from the CPU or CPU OPT headers, aswell as the 2 4pin Chassis headers behind the IO cover.
Ive tried 2 fan hubs, a phobia 8 way fan hub and now a SilverStone 1-to-8 PWM Fan Hub. All fans are 4pin PWM Corsair SP120's. I've set the hubs up correctly and have tried everything I can to control them via the UEFI, also I've tested each fan header with a single fan( 4pin), and they're all good.
My only conclusion is that the fan headers aren't actually putting out a true PWM signal, instead they are just DC controlled.
I just need to know if anyone has run into this problem with the Z97 Classified, and if how they fixed it.

My only idea is to run 4 fans of each CPU header and speed control them that way, but the headers only have 1 amp each and 4 SP120's on each will use exactly that.
Should I be worried about the headers dying?

The CPU and CPU-OPT are true pwm and shoud work with the correct splitter. You need to make sure you have a real pwm splitter. The other fan headers on the board are variable DC and change voltage instead of doing a PWM signal. Verified with manual page 8/9. This is fairly common with motherboards. Can you run a single pwm fan without the splitter on CPU or CPU-OPT?

Edit: You will want to get a splitter that is powered directly from the power supply, You should get your PWM signal and your rpm on mobo header.
post #4 of 7
Thread Starter 
Yeah from the looks of it the Z97 Classified UEFI doesn't have the option to change the pin count for the 4pin header. Also the fans say 0.25 amp on the back on the motor, don't know why it would be different on the website, that's weird.
post #5 of 7
Thread Starter 
Yeah I tested the CPU and CPU OPT headers with a single SP120 fan, and the speed control works perfect. As for the fan hubs I've tried the SilverStone 1-to-8 fan hub and a Phobia PWM 4pin splitter, http://www.pccasegear.com/index.php?main_page=product_info&cPath=9_511&products_id=29256&zenid=5e06bf0f321e17d5c5ce8c4bc2b816a7 . Both are powered from the PSU. The manual only has info about the headers on page 26/ 27, pages 8 and 9 are just overclocking info.
post #6 of 7
Quote:
Originally Posted by merceless View Post

Yeah I tested the CPU and CPU OPT headers with a single SP120 fan, and the speed control works perfect. As for the fan hubs I've tried the SilverStone 1-to-8 fan hub and a Phobia PWM 4pin splitter, http://www.pccasegear.com/index.php?main_page=product_info&cPath=9_511&products_id=29256&zenid=5e06bf0f321e17d5c5ce8c4bc2b816a7 . Both are powered from the PSU. The manual only has info about the headers on page 26/ 27, pages 8 and 9 are just overclocking info.

I was looking at the downloaded manual, weird that the pages are different. Here's what I looked at...




The splitters should work on the CPU and CPU-OPT. I'm not sure whats up with that. They power up but don't change speed?
post #7 of 7
Thread Starter 
yeah they get power ( from the PSU) but for some reason they aren't being controlled by the CPU and CPU OPT headers, almost like the hub isn't detecting a PWM signal. Also I tried the 2 4pin headers under the IO shield (supposedly PWM also) and they don't work either. I think I'm going to need to just use DC 3pin splitter cables to control speed. Kinda frustrating still...
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