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Thread: what's the maximum wattage/amp per fan header for Z77 Extreme6




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    Default what's the maximum wattage/amp per fan header for Z77 Extreme6

    hey guys,

    i need some quick support from the Asrock reps. i am buying some fans and plan on using a splitter to connect 2, or maybe 3 fans to per single chase fan header. and was wondering what's the maximum safe amp/watt per fan header on the Z77 Extreme6 board. is it .5 amp? 1 amp? 2 amps?

    please chime in if you can.

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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    Most go by 1.0amp per header, maximum.
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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    yeah, i figure as much, but i was hoping maybe an official rep from Asrock can confirm that.

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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    Take a go at it using the below contact info then.

    ASRock USA Contacts

    Support Phone: 1-909-590-8308
    Support Email: support@asrockamerica.com
    Support Website: ASRock Support Request Form
    #1 - Please, when seeking help, enter the make and model of ALL parts that your system is comprised of in your Signature, or at least the model #'s in your System Specs, then "Save' it.
    ____If you are overclocking, underclocking, or undervolting any parts, informing us of this and their values would prove beneficial in helping you.

    #2 - G.Skill RAM Configurator for your boardSamsung Memory for your boardLatest AMD Chipset Drivers/WindowsLatest AMD Graphics Drivers/WindowsLatest Intel Drivers

    #3 - Please use the eXtreme Outer Vision Power Supply Calculator found HERE to determine if it might be your PSU at issue.
    ____Consider your PSU to be the foundation from which all else is built upon. Anything built upon a weak foundation is poorly built.

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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    thanks! i'll shoot them an email. :)

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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    i got a response back from Asrock USA.

    CPU 1 head is 12 watts, CPU 2 header is 6 watts

    Chasis fan 1 header is 12 watts

    all the rest are 6 watts.

    problem solved. :)

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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    Interesting. Thanks.
    #1 - Please, when seeking help, enter the make and model of ALL parts that your system is comprised of in your Signature, or at least the model #'s in your System Specs, then "Save' it.
    ____If you are overclocking, underclocking, or undervolting any parts, informing us of this and their values would prove beneficial in helping you.

    #2 - G.Skill RAM Configurator for your boardSamsung Memory for your boardLatest AMD Chipset Drivers/WindowsLatest AMD Graphics Drivers/WindowsLatest Intel Drivers

    #3 - Please use the eXtreme Outer Vision Power Supply Calculator found HERE to determine if it might be your PSU at issue.
    ____Consider your PSU to be the foundation from which all else is built upon. Anything built upon a weak foundation is poorly built.

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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    Quote Originally Posted by howzz1854 View Post
    i got a response back from Asrock USA.

    CPU 1 head is 12 watts, CPU 2 header is 6 watts

    Chasis fan 1 header is 12 watts

    all the rest are 6 watts.

    problem solved. :)
    Thanks for that information. 12W at 12V DC means 1 Amp for the CPU Fan 1 and Chassis Fan 1 header.

    6W at 12V DC means 0.5 Amp for the CPU Fan 2 header and the other Chassis fan headers . That is surprising, IMO that is rather low for mother board fan headers. I will check into this on other boards, but if I would have known this before I bought my ASR boards, it is possible that I would not have purchased them.

    Fortunately, most current fans have trended towards using less power, but check the power draw of the fan you use on the CPU Fan 2 header. I just put a 0.5A rated fan on the CPU Fan 2 header of my ASR Z77 EX 4 board, which at best has the same power spec for that fan header as the Z77 EX 6. Not to mention some large chassis fans that are over 0.5A that I've been using on the mother board headers. Looks like I might want to switch a fan or two.

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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    yeah, i am using a splitter through it right now connecting two antec Tricools. each one rated at 2.85watts. one thing you gotta watch out for tho, some fans have higher than normal startup voltage.

    for example, GT Ap fans although are incredibly efficient, something like less than 2 watts, can't remember, but they actually require a higher voltage during startup. so factor that in, if you're gonna connect a whole bunch of them to the same header.

    i did some research on my Antec Tricool, the best i could find was that it requires maximum 5 volt for start.
    i7 3770K @4.8ghz (1.37v)
    Watercooled w/Black Ice GT Stealth 360(360mm) + GT Stealth 120 (120mm) radiators
    W/ Swiftech MCP655 vario (D5)
    Koolance CPU 380i waterblock
    AsRock Z77 Extreme6
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    Default Re: what's the maximum wattage/amp per fan header for Z77 Extreme6

    You make a good point about the start up voltage, but voltage and power are two different things.

    Yes, most if not all PC fans have a lower start up voltage than their rated max of 12V - 13.8V, which is a good thing. But it's the power surge that a fan draws to get started that might be a problem with a low wattage fan header. Fortunately that power draw is very short term, which is why we don't have fan header circuitry burning out on boards.

    Multiple fans on a low wattage header might draw, or try to draw more than the rated wattage of the header. Beyond that we get into the fans resistance, and that of multiple fans wired in parallel, which creates a lower resistance IIRC.

    Too many unknowns here (including my knowledge about it) to decide what will happen. Bottom line, if multiple fans on one header don't start, it needs our attention.

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