Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
On Fri, 11 Feb 2005 07:51:08 -0500, nospam@needed.com (Paul) wrote:
Thats really strange.....I tried running with only a 20 pin plug and
my machine would not run....fans turned, led on motherboard lit up but
thats it. It was a 430watt Enermax supply. I bought a new Thermaltake
480 watt supply with the 24 pin adaptor. Installed that and had unit
up and running. Ran for about 2 hours and died....replaced a faulty
motherboard and its been running since without any problems. I never
did try to run with just the 20 pin connector. I know, I know....you
can buy just the adaptor, 20 to 24 but I wanted a new PS that had a
higher output rating....
>In article <9tpn01dg7v1bbanqn9ik8fg1rkduffvjts@4ax.com>, Harry
><harry_wz@NOSPAMhotmail.com> wrote:
>
>> On 10 Feb 2005 17:17:28 -0500,
>> steveclaeys@telenet-dot-be.no-spam.invalid (claeyss) wrote:
>>
>> My A8NSLI deluxe uses a 24 pin ATX connector. You need to get a 20pin
>> to 24 pin adaptor. It is a good idea also to replace the PS with one
>> with higher wattage output. I am running a Thermaltake 480 watt in
>> mine. 2 x SATA (RAID), 1 x ATA hard drive, 2 DVD writers, floppy
>> 1x 6600 GT video card (can't afford 2nd yet) and 1 gig Corsair ram
>> (512 x 2 matched pair)
>
>Using a 24 pin power plug is not absolutely essential. Of the
>extra four pins, one pin is a +12V pin, and it is used to supply
>power to the video card(s). The A8N-SLI also has the EZplug, which
>is a disk drive power plug that feeds the video card(s). Between
>the one +12V pin present on the 20 pin portion of the power
>connector, and the one +12V pin present on the EZplug, that can
>pass up to 6+8amps = 14 amps to the two video cards. That is
>plenty to power two video cards.
>
>From some Asus promotional material:
>
> "Unlike the SLI solutions by other manufacturers, the
> EZ Plug supports the 20-pin standard, which is still
> currently the mainstream. Users who want to upgrade
> to the latest SLI platform, can save the extra cost on
> a 24-pin power plug."
>
>Are the fans spinning after you press the power button ?
>That means the PSU is getting the signal to start (PS_ON#).
>
>In this case, you need to connect three power connectors.
>The 20 pin ATX main cable, the 2x2 square +12V (processor
>power), and the EZPlug (video card power assist).
>
>This is how the powering works, based on what I've read.
>What I don't know, is if the EZplug comes with an interlock,
>to prevent the board from powering up if the red LED is lit.
>
> ATX 2x2 +12V ------------> Two power pins to ... Athlon64
> ------------> Vcore (16amps max) Processor
>
> (24th pin +12V wire) ------6amps max----+---+---VideoCard1
> | | (approx 5amps)
> (20th pin +12V wire) ------6amps max----+ +---VideoCard2
> | | (approx 5amps)
> (EZplug +12V wire) ------8amps max ---+ +---Fans
> (approx 1amp)
>
>If you use a 24 pin power connector, you have room to push
>12 amps right there. Enough for the load shown on the right
>of the diagram. But the Asus marketing material claims the
>shorter path from the EZPlug to the video cards helps. Inserting
>the 24 pin plus the EZPlug can only help.
>
>If you use a 20 pin power connector plus the EZPlug, you have
>room to push 14 amps (and the big "if" here, is whether an
>old power supply with a 20 pin connector, could actually be
>big enough to supply 20 amps or more for the total load in
>the computer). The manual has a section detailing total load,
>and it recommends some total amps on output for various configs.
>
>So, the combinations one more time:
>
>24pin + 2x2 processor power (theoretically enough)
>24pin + 2x2 processor power + EZplug (improved stability)
>20pin + 2x2 processor power + EZplug (good working combo)
>
>If you have a single low end PCI Express video card, you could
>try the following. Since the 20 pin ATX power only passes
>6 amps via one wire, you will need to find a review of your
>PCI Express video card on Xbitlabs, to find out exactly how
>much your card draws. The fans draw some current, leaving
>about 5 amps for your single low end graphics card.
>
>20pin + 2x2 processor power (lower end graphics only
> or at least be careful to
> research your total load)
>
>As for the PCI Express standard, I don't actually know what
>the amperage limit is for the video card edge connector. I
>think PCI Express has an overall 75 watt power limit for the
>slot, and that power will be split over the +3.3, +5, +12V
>and so on power pins on the edge connector. I think there was
>an article that stated the number of pins and how many amps
>each (like an amp per pin on the edge card), but cannot find
>it right now.
>
>HTH,
> Paul
>
>>
>> >Hi,
>> >
>> >I just bought me a new mobo: ASUS A8N-SLI.
>> >I installed it in an ATX case with a 20 pin power supply connector
>> >(power supply 350V).
>> >I installed an athlon 3500+ cpu and 2x512 DDR 400 on it.
>> >I plugged in the 20pin and 4pin power supply connectors, powered it
>> >on, my case led lights up, the green led (SB_PWR) on the mobo lights
>> >up ...
>> >
>> >BUT i can't boot the pc? If i push the power button, nothing happens.
>> >I switched the PWRSW pins a couple of times on the system panel
>> >connector > no effect...
>> >
>> >Someone has an idea what can be wrong?
>> >greetz,
>> >Steve