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Dark Knight cooler on FX-8350 PWM problem

post #1 of 3
Thread Starter 
Hello!,
I am currently running an FX-8350 (stock clock) on a Crosshair V Formula Z and have recently (finally!) swapped out the CPU cooler. I decided on the Dark Knight SD1283 for the 8350, the value for me was a no brainer. Ok, so after installing the cooler and not touching any settings in BIOS or windows, the fan was spinning at 2050, just under it's stated max speed of 2200 rpm. I tried adjusting the speed from Fan Xpert, no dice. I booted to BIOS and tried adjusting the speed there and still nada. I tried changing the fan type from PWM (which is what the fan is) to DC and to my surprise it worked! As soon as I switch back to it's native PWM setting the fan spools right back up to 2k+ rpm. I switched back to DC and the fan responds to different modes (standard, silent, turbo, etc) in Fan Xpert, unlike in PWM. In DC the only issues i've noticed is when I test the fans speeds in FX =, the fan completely shuts off until I exit the test. Also i'm unsure if the rpm scales w the temperatures rising and falling in the CPU. Anyone's input would be greatly appreciated on my situation, as I don't know why PWM doesn't seem to work and I don't want to risk any damage I might be doing by running it in DC. Thank you in advance!

John G.
post #2 of 3
When you were running the stock heatsink, did the PWM work properly with it? That would be maybe the first thing I would check with troubleshooting. Then also maybe see if the new Xigmatek fan runs correctly off a different header. That motherboard has 2 PWM headers, for those who like dual fan CPU coolers. I would plug it into the other one if you haven't tried that already. I hope this might be helpful.
post #3 of 3
Thread Starter 
Thanks for the reply! The original cooler that came with the 8350 ran as expected in PWM mode, the rpm's scaled with the temps and although it was really (really!!) loud it worked correctly. The only reason I decided to swap out the OEM cooler was the noise from it was ridiculous, aside from that everything seemed normal. I never did try the OEM unit in DC mode though. I did try plugging in the new fan to the 2nd PWM for the CPU. It behaved the same way as if it were in the primary plug. The only difference was that AI suite kept warning me that no CPU fan was connected. I also tried booting with the new fan plugged in as normal but with Q-fan control disabled. The fan ran as though it was set to PWM, maxed out.
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