P4C800-E Deluxe Power Requirements
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From: Ken on 15 Apr 2008 06:58 On Mon, 14 Apr 2008 00:48:54 +0930, "Fred" <bluser(a)gmail.com> wrote: >> Does the P4C800-E Deluxe motherboard require a -5 volt power supply (in >> addition to the usual 12v)? >> >> If the answer above is Yes, what will happen (or not happen) if I use a >> power supply that does not provide -5v? Will the board work properly? >> Will other devices (drives, USB) work properly? >> >> I know -5v is not used anymore but this board *seems* to want it. > > > Why do you think it needs it? Is there a problem of some sort and you think > the lack of -5V is the problem? > Maybe it's not booting up. That can be due to incompatible RAM. > Anyhow mine runs quite happily from a power supply without -5V and Asus have > a question in their FAQ for this board that they get asked all the time. > http://support.asus.com/faq/faq.aspx?SLanguage=en-us&model=P4C800-E%20Deluxe > Q: My newly purchased ATX power supply does not have -5V voltage. Could this > power supply be used on present motherboard? > A: ATX power supply voltage of -5V is available to traditional ISA interface > device. If your motherboard does not offer traditional ISA interface, or you > are not using any of the ISA interface device, then, your system does not > need -5V voltage. I use the P4C800-E Deluxe motherboard without any -5V and it's no problem at all. All USB ports works perfect. This is my power supply http://www.antec.com/specs/TPII550_spe.html
From: tobe on 15 Apr 2008 12:35 The -5v was dropped from the ATX12V power supply specifications in, I believe, 2002. AFAIK, the -5v was ONLY used for add-on legacy ISA cards. The -5v is still present on occasional power supplies. If present it is the white wire going to pin #20 on the connector (either the 20 or 24 pin connectors). The -12v (pin 14) is also rarely used (? also only ISA cards) and will eventually be dropped. Both the -5v and -12v design specification recommendations have been dropped to +/- 10%. Peter wrote: > Does the P4C800-E Deluxe motherboard require a -5 volt power supply (in > addition to the usual 12v)? > > If the answer above is Yes, what will happen (or not happen) if I use a > power supply that does not provide -5v? Will the board work properly? > Will other devices (drives, USB) work properly? > > I know -5v is not used anymore but this board *seems* to want it. > > Peter > -- > > **Remove Xs to reply by e-mail**
From: jhock on 19 Apr 2008 17:38
Peter wrote: > On Mon, 14 Apr 2008 12:38:05 -0400, Paul <nospam(a)needed.com> wrote: > > >> Peter wrote: >> >> >>> Paul - >>> >>> Thanks for your reply. My USB ports still work and still provide power to >>> my external USB hard drives (at least they do most of the time). The >>> problem is difficult to describe. The drives have become flakey since the >>> removal of the -5v power supply. When I am copying files to one of the >>> external drives the first ten or so files copy normally but then the >>> copying just stops. The drive no longer writes data. Also, I >>> occasionally hear an audible beep coming from the drive which I think >>> means a power problem. >>> >>> Prior to removing the -5v power supply from the PC the external drives >>> worked perfectly all the time. The flakey behavior coincides exactly with >>> the removal of the -5v power. When I move the external drives to a >>> different PC they still work perfectly - so it's not a drive problem. >>> >>> This problem happens regardless of which USB port I use on the PC. >>> >>> Peter >>> >> Would it be possible to install a powered USB hub (has its own AC adapter), >> between the P4C800-E motherboard and the external drives ? >> >> An alternative solution, is to install a PCI USB2 card and see if the >> symptoms remain. You can continue to plug your keyboard into the >> motherboard USB, but could connect external enclosures to the PCI >> card USB ports. >> >> http://www.newegg.com/Product/ProductReview.aspx?Item=N82E16815104216 >> >> Paul >> > > Paul - > > I certainly could get a powered USB hub or a PCI USB2 card but I'd rather > try to figure out what changed in the PC to cause this problem. This PC > with the external USB drives worked fine for a few years. Now there's a > problem with the external drives and it started at the exact time the -5v > power supply went away. If getting another power supply that has -5v will > fix this problem I'll do it. If that's not the cause then I'd like to > know what is. (I have no other suspects than the power supply.) > > Peter > -- > > **Remove Xs to reply by e-mail** > Peter. I have the same MB and my power supply failed so I thought I would just hop over to Microcenter and buy a new 500 Watt Antec supply. It did no have the -5 volt line and did not work. had a hard time finding anyone that still made a power supply with the -5 line, finally bought one from, I think it was PC Power and Cooling called the T51ATX Turbo-Cool. it was not cheap but it works great, that was two years ago. My Antec was under warranty but I went thru a lot of grief getting them to send a replacement , lots of calls etc. Did finally get it. Jack |