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Thread: Negative 5V Rail on Power Supply

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    Default Negative 5V Rail on Power Supply

    I am just about fed-up on talking to Asus supports (Have talked to 8 different person from Asus support). Seen several very in-depth power supply reviews from johnnyguru, thought this might be a good place to get this resolved once and for all, hopefully.

    I have Asus P5N21-E SLI motherboard, E6600, 8800GT SLI, 2 x Raptor HDD, 1 DVD-RW, Toughpower 650W.

    Prior to assembling the system, there is a reference to -5V on Asus's manual (but neither Toughpower nor any other power supply has -5V rails) so I contacted their support for help. Their response was the motherboard does in fact need a power supply with -5V rail but they weren't able say which power supply has it. All of the power supply that I've check has the -5V rail (PC Power Cooling, Antec, Corsair).

    I tried to power supply up any way, and it has been running continously for 4 days without any hiccup (the Toughpower is extremely quiet BTW, I've tried Antec and Cooler Master before but this is most quiet running Power I've ever used )

    So does my Asus motherboard need the -5V rail in order to work? Thanks a lot and hope everyone will have a enjoyable Thanksgiving holiday!!

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    Your board does NOT need the -5V rail. Period.

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    You would think that Asus support would have known that. I mean the -5V rail has gown from PSUs for how many years now? I can't remember a motherboard that actually required the -5V rail.
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    I seem to recall that the on board sound of some not too old MSI mobos(three years old maybe) needed the -5V.
    That was the last lack of -5V complaint I saw posted.
    Worth a good looking over. http://www.badcaps.net/

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    Right. The ONLY time I've seen -5V used on an ATX12V motherboard is if it uses a sound chip w/ amplified audio (non-powered speakers can be plugged in and heard.)

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    Quote Originally Posted by GalvanizedYankee View Post
    I seem to recall that the on board sound of some not too old MSI mobos(three years old maybe) needed the -5V.
    That was the last lack of -5V complaint I saw posted.
    Bingo. I have one of those boards so it still keeps using a SuperFlower

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    thanks to everyone for the information! my system is still going strong w/o any issues.


    have a great holiday!

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    Quote Originally Posted by GalvanizedYankee View Post
    I seem to recall that the on board sound of some not too old MSI mobos(three years old maybe) needed the -5V.
    That was the last lack of -5V complaint I saw posted.
    Indeed, my two year old board in fact. The MSI K8N Neo4 Platinum/SLI (MS-7100) needed it for its onboard Creative SoundBlaster Live! 24-bit (CA0106) to be exact. Good board, not MSI's fault that AMD obsoleted socket 939 as fast as it did.

    Now I've moved onto a Core 2 Duo setup with a Thermaltake Toughpower 750W power supply with no -5V rail.

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