Corsair 300R Fan Allocation

By AldinD2x
Jan 10, 2016
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  1. Hi Everyone,

    I got a little bit over zealous on the holiday season and instead of upgrading one or two parts, I pretty much bought a new rig. (Don't tell my wife!) As part of the new setup, I really wanted to give these pseudo water coolers a go. I ended up installing the H80i GT in an exhaust setup with a push pull config. I am wondering what other fans I should include. I'll link a picture below for reference.

    My Spec
    - CPU: Intel 4690K
    - Cooler: Corsair H80i GT
    - Mobo: Asus Z97-a 3.1 USB compatible
    - GPU: EVGA 780 TI
    - SSD Samsung PRO 120 GIG
    - HD WD Black 640 GIG
    - RAM: GSKILL DDR3 2x8 GB Sticks
    - Case: Corsair 300R

    Things to note:
    - CPU cooler fans are the corsair supplied 120mm
    - The front of my case only has 1 x 140mm
    - The side plate has two spots for 120 mm fans that are empty
    - The top has an empty grill that could fit 2x 140 mm fans

    Any feedback would be appreciated. The whole positive vs negative pressure topic has me a bit on the fence.

    Thanks in advance.
  2. B00kWyrm

    B00kWyrm TechSpot Paladin Posts: 1,436   +37

    A. Is your front fan filtered?
    b. What is the cfm rating on the front fan?
    c. What is the cfm rating on the watercooling fans?

    Reason for the question...
    if the watercooling system is putting more air through it,
    than your front fan is putting into the case,
    then your unfiltered vents (top and side) will be allowing dust to enter.
    You could add magnetic filters to any of those locations.
    Corsair makes (as do others) some hi-cfm fans
    that you might consider as replacement and addition options
    to create a positive case pressure, preventing unfiltered air from entering.
    The hi-cfm fans will increase your noise level.

    Others with more experience will have other comments, I am sure.
    Personally, I would probably add a front fan below your existing, making sure both are filtered.
    I suspect that would be enough to maintain positive case pressure.
  3. Cycloid Torus

    Cycloid Torus Stone age computing. Posts: 3,026   +665

    I personally like positive pressure as it assures flow through the PSU and since the intake fan is mid-case there is less dust build-up.

    I monitor temps from time to time and it seems to work without any dead spots as I have the mid-case intake aimed directly across the motherboard.

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