PRO Z790-P WIFI DDR4 Not Seeing All System Fan Speeds

havecoolt157d02e2

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Mar 17, 2025
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System fan speeds are always at 0 rpm in BIOS and MSI Center. Fans are working but no rpm reading.
Using an ASUS ROG RYUJIN II CPU Cooler that uses a USB header for AIO and a Hub for system fans
also plugged into a USB header. Anyone have any ideas why it's jacked up?

Screenshot 2025-03-17 072131.png
Screenshot 2025-03-17 071814.png
 
Fan speed detection depends on the Pulse Width Modulation (PWM) sense signal sent to the motherboard fan headers. You must connect to the fan headers to get speed information. You will likely have to use the software that comes with your cooler to monitor and control the cooler.
 
There's a couple much more important questions that your screenshot brings up.

1) You are running a completely outdated BIOS version, even though your CPU model is affected by buggy microcode in older BIOS versions. On an old BIOS version, the CPU slowly gets grilled from spikes of excessive voltage, which eventually causes CPU degradation to the point of instability, so you need to update to the latest BIOS version ASAP. There have been many a 13th/14th gen CPU that have been irreversibly deteriorated by the voltage spikes and had to be replaced by Intel.

After the update, you will probably notice higher temperatures and perhaps even a bit lower performance. You can then go by my Guide: How to set good power limits in the BIOS and reduce the CPU power draw, it describes two steps to optimize how a CPU is running: Step 1, setting proper power limits for your system, and step 2, lowering a setting called "CPU Lite Load", for huge benefits in lower voltage, lower power draw, less heat, and even higher performance within the power limits. I explain it all in there, it's easier than you might think, and the results will speak for themselves.


2) You are using two different kits of 2x 8 GB (one kit of DDR4-3600, one kit of DDR4-3200). Doesn't matter that they're both from A-DATA, they use completely different hardware most likely. Two problems with this. First, if you want 32 GB total, and you cannot get the exact same kit again with the exact same hardware (regarding the memory chips on the modules etc.), then it's usually better to replace the 2x 8 GB with a kit of 2x 16 GB, also see my RAM thread.

Because, second issue, there can only be one set of RAM parameters for the whole memory system, but with two different kits, it has to be some compromise that tries to make two RAM kits with modules using completely different ICs (memory chips) happy at the same time, even though they need different parameters from the board. Now, in your case, it should work at the lowest common denominator, DDR4-3200. But apparently you have it on a way too slow DDR4-2666 right now (most likely with loose timings too).

So after the BIOS update and other optimizations mentioned in 1), i would suggest to enable XMP, with the DDR4-3200 profile, and see how it works. Because DDR4-2666 is a bottleneck nowadays, you undo all your work of having more RAM. Which in itself doesn't really give a benefit, unless a game can actually use more (which very few will). But if you have to go to this low speed for having more RAM, you mainly make things worse, not better.
 
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