Silent Power Supply

    I'm looking for an ultra-quiet or dead silent (fanless) PSU for my PC. 400W will do.

    Is there anything under £40?

    Karma waiting for all your help...


    Original Poster


    But I think this one looks better to me, but I'm not sure if it is not going to be a bit loud...…672

    I have my computer on during nights in the room where I sleep... so it really should be quiet.

    I'd make sure all your other fans such as case fans, cpu fans etc are silent too. It'll only be as quiet as your loudest fan but I guess that's obvious.
    Personally I think it's important not to skimp on a PSU as tempting as it is. It might be worth posting your specs too so we can see how much power you will need, as a namebrand 400w PSU is likely to be far more stable and powerfull than a cheap 600w PSU.
    Brands like Antec, Seasonic, Tagan etc are generally good manufacturers.

    Original Poster

    My specs are as follows:

    Athlon XP 3200+ overclocked by 10%
    standard AGP graphics card (not even sure of the make)
    2 x 512 DDR RAM
    2 x SATA drives
    1 x IDE drive
    DVD-RW/CD-RW combo
    1 case fan
    1 CPU fan

    Currently I have a 350W PSU with
    28A on +3.3V
    38A on +5V
    19A on +12V
    0.8A on -12V
    2A on -5V

    and I'd say it works just about right, but it's a bit loud...

    my tagen is absolutely amazing, i don't know the model number, but it's got a 12cm fan which helps being a lot quieter, and is modular so you use only the cables you need, reducing clutter and giving a better airflow through the case

    for case fans, if you know what you are doing go for Silenx fans, available online as KustomPCs, i've got a 9db version, and i can only hear it when i have my head next to it. it doesn't shift much air, but the "deeper" version shifts much more air and is something like 13db, which is still practically silent.

    they are very expensive for fans, but are great, you need to watch your case temps if you're going to use a silent fan like these

    I got bitten by the QUIETPC bug before christmas. It is an easy way to spend way too much money.
    You really need to face the fact that if you want to get a nice quiet machine, you'll have to pay through the nose for it. :x
    If your budget is fairly rigid I would go with an Enermax model. specifically >THIS ONE<
    The fan speed can be controlled manually, the lowest fan speed is barely audible.
    If you can stretch your budget a bit further I would recommend another ENERMAX (400W)
    The larger fan means a lower speed and thus less noise, hurrah. The fan speed is controlled automatically by temp sensor (in your case I see this as a disadvantage - cause it could decide to go into hair-dryer mode in the middle of the night) The big selling point for these power supplies is the removable cables. If you have ever replaced a power supply before, you'll know how irritating it is trying to locate a suitable nook to hide the surplus connectors.

    Finally - like Brodel said you need to investigate your PC to find the main sources of noise. This can be different in every PC. I bought an nvidia 7800GT gfx card, and it ran really hot all the time, so the 40mm fan on the graphics card sounded like a buzz saw. I used one OF THESE and halved the noise from my computer in one go.:lol:

    Let me know how it works out


    I wonder how those manufacturers like DELL and HP could managed to produce a very quite PCs. I'm using a DELL machine in the office and I could barely hear the fan.

    Is there any way to find out the PSU wattage and details with a pre built pc.

    There are two ways:
    1. Open PC and read label on PSU. This one is preferred unless your machine is still under warranty.
    2. Phone manufacturer/assembler/seller and ask for specification.

    One important thing about PSUs is not to trust to what advertisement says. It may have BIG sticker claiming 900W but if you read the data on label you realise that it only can give you 235W or something like that Same trick as RMS and PMPO, really

    I personally bought Antec TruePower 430W and very pleased with it. The only drawback is that it only supporting 20-pin connectors and not 24-pin ones. But even so, my AMD x2 3800 with 4 HDDs, 2 opticals, videocard and 2GB of RAM, etc works perfectly

    I'm not sure I would trust the information supplied by the current "highly motivated, team spirited,completely clueless" call centre operatives that you would ask with option 2 from Kommunist.
    Even if he machine is under warranty the information should be clearly visible when you remove the side of your PC

    The Bottom left gives you the total power provided, with the value derived from the maximum peak current available for the different voltage systems in the computer. (+3.3V; +5V; -12V; etc)

    If you give me the model of your computer I may be able to find out ~ Viva Google ~


    thanks i figured out I should just look inside and got all the info. Twas 350w and i hav wrote down the other details. I too am looking for a new PSU, don't really want to pay more than £25, but would also maybe like a new snazzy case so would pay more for that. I would probably want at least 450W plus.

    Also like the look of that ebuyer one, when do you think it will be back in stock?

    Look at this for a snazzy case, and only for £24.99! You can buy one online for pick up at your local store, or get it delivered for £2.50, which isn't bad...



    I wonder how those manufacturers like DELL and HP could managed to … I wonder how those manufacturers like DELL and HP could managed to produce a very quite PCs. I'm using a DELL machine in the office and I could barely hear the fan.

    My work Dell blows like a hairdryer if I give it anything more difficult to do than email plus terminal emulation.
    IMO if you tried to do anything meaty on an office Dell for very long then you would probably end up with a very ugly paperweight.

    Quoting Watts for a PSU really isn't at all useful.
    As shown already, you need to look at the Amps being supplied to various voltage lines. Look out for PSUs that have PFC (power factor correction) - these are more efficient and supply more Amps per wasted Watt.
    For self builders, the mobo manual might give you a clue e.g. the Asus A8N VM-CSM clearly states that you should have 20A on the +12V line, which is helpful, but over cautious.
    Try this one from Silvertek…htm
    It's only a 300W PSU, but supplies more Amps on the +12V line than my [email protected] 500W PSU that came in my Viper case. It is dear though, but makes 0 Db noise.

    And bear in mind that a cheap PSU could result in more crashes, or even system damage.

    Original Poster

    Thank you all for help. I've given everyone some karma.

    In the end I decided to go with the NorthQ 4775-400 unit, which is said to be one of the quietes PSUs with a fan. It contains a 140mm fan (sic!), so I hope it will be quiet. I managed to get a good deal on ebay for it, so I'm happy.

    i'd be very careful about a no fan PSU, they generate a lot of heat, and some air movement is 100x better than none


    i'd be very careful about a no fan PSU, they generate a lot of heat, and … i'd be very careful about a no fan PSU, they generate a lot of heat, and some air movement is 100x better than none

    Good point!
    Some new case designs are actually designed to use the PSU fan as a major or an exclusive (see Aopen G325) way of case cooling. You certainly need to scratch your head a lot these days to balance heat and sound.

    Best site for silencing PC stuff is silentpcreview, they are seriously obsessive there. Here's the page for PSUs:…tml

    The Seasonic 430w is about £40 on ebuyer. Don't go for a cheapie noname, if they blow they can frazzle your motherboard.
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