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Thread: Tagan PSU - Combo Switch?

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    Tagan PSU - Combo Switch?

    Just got a new Tagan PSU, it has a switch on the back for 12v, saying "split" or "combined". What's this for and when would it be used? Manual doesn't really explain (at least not that I could see)

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    Treasure Hunter extraordinaire herulach's Avatar
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    It will split the 12V rail, either using seperate rails for mobo and drives, or one (beefier) rail for both.

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    What's the preferred mode then?

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    a split rail is generally more efficent, unless the power in your grid nearly browns out when you hit the power button.
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    I'll leave it as split then

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    Not Very Senior Member RavenNight's Avatar
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    A single rail can be more stable if your not running a system that requires a dual rail

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    Quote Originally Posted by RavenNight
    A single rail can be more stable if your not running a system that requires a dual rail
    And how do I know if it needs a dual rail?

    Currently running DFI skt 939, A64 3000 (venice), 2Gb RAM and a 7800GTX along with 2 x SATA drives and 2 x IDE drives (all 7200RPM)

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    I’m just building a new rig for my son and I also have a Tagan psu with the split combined choice. It is the TG480-U22 model and according to page 17 of the manual it says:

    Quote Originally Posted by Manual
    a. In “split” mode each +12v rail is limited to max 20A (or less)!

    b. In “combined” mode the total current of all +12 rails is limited to the specific maximum value of each psu (see chap 5)

    Note:
    Standard operation is the “combined” mode and the “split” mode is used as “workaround” solution only (see chap 4)
    It appears that combined is the one to use not split.

    I am using combined but have I misunderstood or is this correct?

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    2 x 12v RAILs @ 20A - sounds pretty damn good to me! Thats a nice big 40A on the 12v RAIL!!

    A64 + NF4 systems work well with a split 12v RAIL
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    HEXUS webmaster Steve's Avatar
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    Current ATX limit 12V rails to 18A I think, which is why to be compliant with the latest standards they have to break the rails down like that (somebody correct me if I'm wrong, I read up on this a while ago now... when I got my PSU). I run mine (2force 530) in split mode.
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    Thanks everyone, I have now set it to operate in "split" mode.

    It does come set to "split" but the manual seems to suggest using it in "combined". Split makes more sense so maybe it's just a mis-print or badly worded?

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    nice after dark, registerd Spetember 03 first post august 05

    23 months

    Anyway back on topic

    manual might suggest combined as its more energy efficient compared to split if what steve says is correct with one rail using 18amps and with the addition of another rail.

    correct me if im wrong on this

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    Treasure Hunter extraordinaire herulach's Avatar
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    Quote Originally Posted by jonny4288
    nice after dark, registerd Spetember 03 first post august 05

    23 months

    Anyway back on topic

    manual might suggest combined as its more energy efficient compared to split if what steve says is correct with one rail using 18amps and with the addition of another rail.

    correct me if im wrong on this
    It doesnt 'use' 18amps, it can supply 18A. slightly different, power output will be the same depending on devices connected (ish)

    And theres nothing wrong with lurking.

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