AMD FX 8350 stock fan not reaching max RPM

ImperialGuardsman

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Sep 22, 2014
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Hello everyone!

I decided to run an experiment: I have an ancient Athlon 64 x2 6400+ and wanted to see if the stock cooler for the current FX series would do a good job of cooling compared to my old Hyper tx2. For the most part, yes it is doing a good job. The problem is that it is only at 3200rpm.
It would really be amazing at 5200-6000rpm, which is what I thought the max rpm was normally. My case has a number of loud fans, so I do not care about the volume.

I have disabled smart fan control in the bios and Cool and Quiet (just in case). Windows power management is at "Performance" and cooling is set to "active." I even tried turning on those settings and using the fan control settings in Easy Tune 5, still maxed at 3200rpm. This stock cooler (the heat pipe one) is brand new and unused (still had the oem thermal paste, which I changed for AS 5).

Motherboard: GA-m57-sli-s4
CPU: AMD Athlon 64 x2 6400+

Thanks!

 
Solution
If you system was having power issues it probably wouldn't run at all. My guess is it is some sort of fan speed management in the bios.. Just hook the fan up to the PSU directly and you should be able to tell right off if it is running faster.
You could always hook the fan directly up to a power connector from the power supply with an adapter if all else fails.. (Old overclockers trick: You can also overvolt your fan too if you have it connected to both 12V and 5V and have it run super fast!!)
 

ImperialGuardsman

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Sep 22, 2014
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That's not the worst idea. I have some cheap 3pin/4pin to molex adaptors from the case fans I have. Now, am I mistaken about the max rpm for this fan? Could the motherboard be limiting the rpm due to voltage or amps? The only other fan connected to a motherboard header is my Noctua 120mm 3000rpm fan.
 
If you system was having power issues it probably wouldn't run at all. My guess is it is some sort of fan speed management in the bios.. Just hook the fan up to the PSU directly and you should be able to tell right off if it is running faster.
 
Solution

ImperialGuardsman

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Sep 22, 2014
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I dug out one of those cheap molex connectors (the pass through kind) and hooked it up. Visually, I can't tell if it is faster (looks about the same) and I cannot hear a difference in volume. Based off of Prime95, the cooling has stayed the same. I'm not sure what is going on.