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NH-D15 different size fans + y-connector gives CPU Fan Error

silverf0x
By silverf0x
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I replaced the front fan of my NH-D15 with a NH-A12x25 FLX (obviously, to clear the RAM) and connected both the original fan and this one on the CPU_FAN using the y-connector but I get a CPU Fan Error. I've tried lowering the threshold to 200rpm, same error. I also tried the various DC-MODE/PWM/Auto settings in my X570-P's BIOS but I always get the same error.

 

Both fans are turning but I can't get the RPM so that's annoying.

 

Should I have used something else than a A12x25 ?
Should I plug them individually instead of using the y-connector?

Any help would be appreciated!

IMG_0153[1].jpg

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When using y-connector, use the same fans

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If I was to plug them separately; Say the big one in CPU_FAN and the A12x25 in CHA_FAN2. Do I absolutely have to have them run the same RPM? If not, what's the best scenario?:
1) Small faster // Big slower
2) Small slower // Big Faster

 

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1 minute ago, silverf0x said:

If I was to plug them separately; Say the big one in CPU_FAN and the A12x25 in CHA_FAN2. Do I absolutely have to have them run the same RPM? If not, what's the best scenario?:
1) Small faster // Big slower
2) Small slower // Big Faster

 

The one in CHA_FAN2 would act as a case fan. So it would probably not take the temp readings from CPU, but somewhere close to the VRM's or Chipset.

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Unfortunately, this MB doesnt have a CPU_OPT (or CPU_FAN2) connector of any sort. Only one CPU_FAN and 3 chassis fan plus AIO of course.

I have the ability to base the speed of the CHA fans on CPU Temp. Not sure if it would be as accurate as the one the CPU_FAN would use tho?

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Do you get an error with Y-cable and just one fan? Does the y-splitter send the rpm from both fans to the mobo so that it doesnt know at what speed they spin?

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2 hours ago, silverf0x said:

I replaced the front fan of my NH-D15 with a NH-A12x25 FLX (obviously, to clear the RAM) and connected both the original fan and this one on the CPU_FAN using the y-connector but I get a CPU Fan Error. I've tried lowering the threshold to 200rpm, same error. I also tried the various DC-MODE/PWM/Auto settings in my X570-P's BIOS but I always get the same error.

 

Both fans are turning but I can't get the RPM so that's annoying.

 

Should I have used something else than a A12x25 ?
Should I plug them individually instead of using the y-connector?

Any help would be appreciated!

IMG_0153[1].jpg

 

You will get a CPU Fan error if the RPM sensing for that cable is screwed.  These things happen when using fan adapters.  Either use the exact same fan next time, or disable CPU fan monitoring in your bios (set it to ignore on an Asus bios).

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Have you tried using the LNA's (Low Noise Adapters)? They have helped me in the past.

Forgive me El Guapo. I know that I, Jefe, do not have your superior intellect and education...

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