Power supply fan replacement

I'm using an EVGA SuperNOVA NEX 650G power supply. Been using it for about 5 months but recently come to realise its too noisy for my liking. I'm just assuming its the fan.

I've found a review on Techpowerup ( for the 750w model and basicly states its noisy due to high RPM from the fan.
Fan specs: D14BH-12 model (140 mm, 12 V, 0.7 A, 2800 RPM, 140 CFM, 48.5 dBA)

Because of this I'm looking into changing the fan. I wanted to sick in an NF-P14s 1200rpm redux fan from Noctua but because of the high RPM from the PSU fan I'm not sure if it'll 'cut the mustard.' I'm still unsure how PSU fans work. I know they use 2 pin connectors but I'm sure I can just get an adaptor or tinker with the other the remaining wires to get it working.

I've never done anything like this before. Just finished my first PC build earlier this year.
14 answers Last reply Best Answer
More about power supply fan replacement
  1. You can try it. No harm done if it can't be used anyway.

    If it doesn't work, buy a new PSU.
  2. I'm not exactly loaded with money though. Would have brought a quieter PSU if I did.

    Anyway, wouldn't it harm my system if it did fail on me? Last thing I want is a broken CPU or GPU.

    Thanks for the quick reply btw.
  3. You could cut a hole in the PSU casing, to have the new fan run off a motherboard fan header. That way you can give it a variable fan speed using speedfan or some other fan controlling software.

    Worst case scenario, you could just remove the internal fan and hot glue a new one on the outside.
  4. You would test it out of the case to start with.
  5. Sorry but I'm a bit confused with what your saying. Replace the old one with a new fan and have that controller via the motherboard?

    Ideally I would just like to relace the old psu fan with a quieter one. Keeping it all incased
  6. Best answer
    Yes. Its just what you intend to do in the first place, except to have it run off the motherboard instead of the PSU's internal 2 pin header.

    If you use that 2 pin header, the new fan will run at full speed all the time. If you have it run off the motherboard instead, you could get it to run slower and quieter, maybe even have it change its speed depending on certain variables.
  7. What fan do you recommend I use for this? I don't mind spending a little bit extra if it means its gonna be more reliable and -preferably- quieter. If it was quiet enough I wouldn't mind it running at full speed.

    Also, what would happen if something did go wrong and my power supply was to overheat? Would that screw up my whole system; break anything important like a cpu or gpu?
  8. What size fan is on the PSU? I thought they were usually an odd size anyway.
  9. You can do it with the NF-P14s you intended to get.

    A power supply with any reasonable amount of circuit protection would cut off the power to the system if it were to overheat, before any damage can be done to other components.

    I don't see why your PSU would overheat with a working fan.
  10. Ok thanks. I only said that because the PSU fan have a much higher RPM, 2800 and 1200 is quite the difference. I'm sure it doesn't spin up to that speed very often anyway.

    I try what you said. I think I'll use the 1500rpm noctua fan just to be on the safe side. but is there anything I can use to check the thermals of the psu.
  11. Apart from sticking a thermometer or thermal sensor at the exhaust, I don't think there are any reliable ways of checking its temperature.
  12. What exhaust temp should I be aiming for and at what temp does the overheat protection kick in?
  13. The exhaust should be more than 10 degrees over the ambient temperature when at load.

    The temperature and conditions at which protection kicks in, varies among different models and manufacturers. I don't think they disclose it anywhere.
  14. Thanks!
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