Cases Designed for PSU Bottom Installation: Advantages?

By Route44
Apr 16, 2010
  1. Any build that I have done the case has been designed with the PSU top mounted. However, the latest trend has been cases with the PSU mounted on the bottom. I am looking at purchasing a new case for a new build and the PSU will be installed on the bottom.

    What are the advantages? Anything to be aware of? Thanks.
  2. dividebyzero

    dividebyzero trainee n00b Posts: 4,891   +1,258

    Having built a few systems with bottom mount PSU's (including my own 800D and Lian Li's) I'd say the principle differences are:
    1. Most modern bottom mount cases have divided interiors (thermal zones)- the "floor" of the main mobo compartment channels air to chipset/graphics card more efficiently.
    2. Bottom mount provides better cable hiding and cable management (providing that there is sufficient room behind the motherboard tray and adequate cut-outs in the tray)
    3. Centre of gravity is much lower
    4. If the chassis has top mount fans then heat dispersal is good. A top mount PSU is ingesting warm air.
    5. Most bottom mount chassis I've used have better clearance/less cluttered space above the motherboard tray, thus a better arrangement for larger aftermarket CPU coolers.
    6. If watercooling, a roof mounted radiator is much more effective than a vertical mount-it will also make for a cleaner complete-in-chassis install -Assuming of course that the chassis roof is capable of accepting a rad.

    That's about it.

    BTW: If the bottom mount PSU chassis is a full tower then checking out the cable length for the motherboard 24 pin and EPS 12v on the PSU before final install could be an advantage.
  3. Route44

    Route44 TechSpot Ambassador Topic Starter Posts: 11,966   +70

    Thanks DBZ! Excellent informed answer.
  4. Ritwik7

    Ritwik7 TechSpot Chancellor Posts: 1,672   +9

    Great analysis DBZ. Especially that last point about cable length. Most people (including myself) would have overlooked that. :)
  5. mailpup

    mailpup TS Special Forces Posts: 6,964   +355

    Of course, one could always buy extension cables if any were too short although I certainly understand wanting it to be the proper length to begin with.
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