News Groups wrote:
>
> Paul,
>
> Your help is greatly appreciated; I want to avoid killing my new MB and
> CPU... I will go with the 2x2
>
> The power supply is a “Thermaltake W0116RU - ATX 12V 2.2 & EPS 12V
> version 750W Power Supply”.
> http://www.thermaltakeusa.com/produc...0116/w0116.asp
>
> Output:
> +3.3@30A,+5V@28A,+12V1@18A,+12V2@18A,+12V3@18A,+12 V4@18A,-12V@0.8A,+5VSB@3A
>
> Connectors:
> 1 x Main connector (20+4 pin)
> 1 x 4+4-pin 2V Power Connector
> 8 x peripheral
> 6 x SATA
> 1 x Floppy
> 2 x PCI-E
>
> Thank you
>
What I was worried about, is there are two ways to wire a 2x4 connector.
And I don't even know if these two have names. I was seeing the first
configuration on dual socket server boards. 12V1 powered Vcore for one
processor, and 12V2 powered Vcore on the second processor. The second
connector occurs on boards like your Gigabyte. Asus has done something
similar on a few boards in the past. Now, one of these is EPS12V, and
it could be the second one, and then I don't have a name for what the
first one is.
12V1 12V1 12V2 12V2
GND GND GND GND
12V1 12V1 12V1 12V1
GND GND GND GND
Since your power supply has four rails, it probably uses the first
configuration. This has to remain a guess on my part, because the
Thermaltakeusa web page doesn't have a wiring diagram. If you plug
the first kind of connector, into a motherboard that is effectively
wired like the second connector, then 12V1 is shorted to 12V2.
Speaking in general terms, for power supplies, that is not a good
thing to do. (Current would flow from one output to the other, as
a function of wire resistance, and the voltage difference between
the two 12V outputs.)
I expect your _motherboard_ is wired like the second connector.
It would be safe, to split the 12V1/12V2 thing in half on the
Thermaltake, and plug a 2x2 section into the motherboard, as then
the 12V1 and 12V2 are not getting shorted together. And since your
processor is not drawing max power, the four pins should be enough
to handle the current.
With triple or quad output power supplies, I recommend obtaining a
wiring diagram from the manufacturer. Few of these supplies have this
necessary information. Even though they may make passing reference
to different specs, I prefer to see the wiring diagram in detail,
as to which connector uses which rail. That makes it easier to
predict whether there will be a burning smell or not :-) Even the
wire colors may not be a good predictor, as some multirail supplies
use the same solid yellow colored wire for all the 12V outputs.
Some companies mix a second stripe color with the yellow insulation,
and then you can see a slight difference in the yellow wire, as
a function of which rail it is connected to.
Good info is hard to find, and there is not even one manufacturer
I can point to, who does a superior job at documentation.
You can plug in a 2x2 section, and get on with your build. And
then send off an email and see if they will provide a wiring
diagram for future reference.
Paul
> Paul wrote:
> >
> > News Groups wrote:
> >> Hello,
> >>
> >> I purchased a better power supply for my GIGABYTE GA-965P-DQ6 that is
> >> running an XE 6800.
> >>
> >> The new power supplies have a 4+4 pin +12V power connector Power
> >> connector and I was wondering how I would connect the cable to my
> >> GIGABYTE GA-965P-DQ6 motherboard. That is, would I connect one four pin
> >> cable as with my current power supply or would I remove the cap from
> >> GA-965P-DQ6 ATX power connector on the motherboard and use both 4 pin
> >> connectors. The new power cable will pop apart at the end if needed.
> >>
> >> The manual describes a 2x2 and a 2x4 power supply but I do not
> >> understand the differences; the power supply is a Thermaltake.
> >>
> >> Thank you
> >
> > It would have helped if you could have given the exact model number
> > or a link to the power supply.
> >
> > Your Core 2 Extreme X6800 uses 75W. 75W/12V * (1/0.90) = 6.94 amps.
> > That is, the Vcore converter draws 6.94 amps if it is running
> > at 90% efficiency, and is converting the needed 75W from the 12V
> > supply.
> >
> > http://processorfinder.intel.com/det...px?sSpec=SL9S5
> >
> > The 2x2 connector is enough to supply 6.94A. The two yellow
> > wires and pins of the 2x2 is good for 12A, or at least 6 amps
> > per pin. (In other words, you can draw 12 amps through the
> > wires, before the pins start to get hot, or there is the
> > possibility of long term damage to the connector.)
> >
> > Connecting the entire 2x4 connector would only be required if
> > a much higher power processor was installed. Maybe with the
> > most power hungry processor that currently exists from Intel,
> > you might justify using the whole 2x4. For the rest of them,
> > connecting the 2x2 is enough.
> >
> > There are two aspects the "the amperes". There is the
> > capability of the wires to carry the current (which is the
> > analysis above), and there is also the ability of the
> > power supply to produce the power in the first place.
> > Your power supply only needs a 12V2 rating of 7A to meet
> > the loading of your new processor. Most likely the
> > supply has a lot more current than that to offer.
> >
> > Paul
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