Re: Asus P5WD2-E Premium +Pentium D 805 no boot problem.

In article <44B99853.5020503@xxxxxxxxxx>, Barry Watzman
<WatzmanNOSPAM@xxxxxxxxxx> wrote:

The "EZ-Plug" (which is a non-standard proprietary Asus invention not
covered by any standards) is an alternative to the ATX12V connector. On
the motherboard, the ATX12V connector and the EZ Plug are tied togehter
(in fact, they are more than tied together, they are just two different
connectors for the same foil runs). Thus, if you use both the ATX12V
connector and the EZ Plug, you are tying the two rails together, which
is not a good idea and which can cause problems. In effect, if you use
both the EZ-Plug and the ATX12V connectors, you are using both rails to
power the processor.


The EZPlug was in parallel with the ATX12V 2x2 connector, on
some of the original P4 boards. My P4B motherboard has that
connector. This is from the P4B-105.pdf downloadable manual:

"In addition to the 20-pin ATXPWR connector, this motherboard
requires that you connect the 4-pin ATX +12V power plug to
provide sufficient power to the CPU.

If you are using a standard ATX power supply that does not
have the ATX +12V plug, connect one 4-pin device power plug
to the ASUS EZ Plug connector labeled AUX +12V."

So, in that case EZPlug is in parallel with the ATX 12V 2x2.

Now, we look at the instructions in a recent board with EZPlug.
From the P5WD2-E Premium manual:

"When installing two VGA cards using a 20-pin ATX PSU with
sufficient +12V capability, we recommend that you connect
the EZ Plug for better current path from +12V. Refer to the
PSU documentation for dual VGA power requirements."

The video card +12V rail is separate from the ATX12V 2x2. The
video card runs from 12V1, and so does a Molex disk drive connector.
On a pre-ATX 2.0+ power supply, all 12V are the same, so that
one isn't a problem either.

So, times have changed Barry. The EZ Plug used to be used as
a substitute for a missing ATX12V 2x2 connector. Now, it is
used to provide extra current for the video card, and that is
an entirely different thing.

Stop trying to confuse people!

Paul

Paul wrote:

In article <44B82E1F.6030004@xxxxxxxxxx>, Barry Watzman
<WatzmanNOSPAM@xxxxxxxxxx> wrote:


If you have a dual rail power supply (and I think you do), using both
the ATX12V and the EZ plug will short the two rails together, which is
not a good idea. First, it defeats the whole purpose of the two
independent rails. Second, the voltage output of the two independent 12
volt rails is not EXACTLY the same, and you can get substantial currents
running between the two rails, which is bad for everything in the system.

I'd suggest that you remove the "EZ-Plug".


12V2 powers only the processor.

12V1 powers motherboard and disk drive connectors. Thus, when
EZPlug is connected to the motherboard, it is the same 12V1
which is present on the main ATX power connector.

Paul


Ghostrider wrote:



all of the power supply sockets on the otherboard were
populated, i.e., 20-pin + 4-pin main power, both ATX-12V
4-pin, and single Molex.


.

Relevant Pages

  • Re: [OT] ATX-PSU and amperage on connectors...
    ... In the ATX12V specification it is written: ... System components that use 12V are continuing to increase in power. ... Main Power Connector ... In the Workstations I will use a SanDisk UltraII 2 or 4 GByte. ...
    (Debian-User)
  • Re: [OT] ATX-PSU and amperage on connectors...
    ... In the ATX12V specification it is written: ... System components that use 12V are continuing to increase in power. ... Main Power Connector ... In the Workstations I will use a SanDisk UltraII 2 or 4 GByte. ...
    (Debian-User)
  • Re: Few questions A8N-SLI-Premium and Antec Case, power supply hookup and fans
    ... connect the board to the power supply. ... the 4-pin ATX+12 V plug. ... ATX power connector to the EZ_Plug. ... do I plug them into the motherboard chassis fan connectors (3-pin ...
    (alt.comp.periphs.mainboard.asus)
  • Re: Computer Power Plug
    ... power supply because they keep breaking at the power plug. ... Radio Shack 2.5mm by 5.5mm plug, but it is not a good connector. ... I have replaced the ends with replacement plugs I purchased from ...
    (sci.electronics.repair)
  • Re: Williams High Speed question
    ... but now the plug bubbled and melted and burnt. ... pin plug on the bottom right of the power board labelled as Gen ... from the six-pin connector. ... I guess that depends on your definition of "rapid fire". ...
    (rec.games.pinball)