In article <eS2Ag.11699$Ca.3928@fe1.news.blueyonder.co.uk>, "Pete"
<not@this.address> wrote:

> Pete wrote:
> > Paul wrote:
> >> In article <_S_zg.10219$Ca.1919@fe1.news.blueyonder.co.uk>, "Pete"
> >> <not@this.address> wrote:
> >>
> >>> I have just bought a Ultra Xconnect power supply 400watts to use in
> >>> conjunction with a AMD 3500+ and skt 939 board.
> >>>
> >>> Here it is:
> >>>
> >>
http://www.ultraproducts.com/product...&productID=304
> >>>
> >>> It says it supports Pentium 4 and AMD CPUs and meets ATX version
> >>> 2.03 and ATX 12V version 1.2 specification.
> >>>
> >>> When I bought it I thought it was the dogs bollocks but now I see
> >>> motherboards with 24 pin PSU connectors and wonder what's going on.
> >>>
> >>>
> >>> Have I bought a lemon? Is it out of date? Has the ATX spec moved on?
> >>>
> >>> Can you plug a 20pin ATX connector from the power supply onto a
> >>> 24pin connector on the motherboard and then use a 4 pin lead for the
> >>> remaining 4 pins or would I need a convertor?
> >>>
> >>>
> >>> The motherboard I want to use it with has the following connectors:
> >>>
> >>> 24-pin ATX Power connector
> >>> 4-pin ATX 12V Power connector
> >>>
> >>> Would I need to buy extra cables / convertors to use it with this
> >>> board?
> >>>
> >>> Thanks
> >>>
> >>> Pete
> >>
> >> <----- ATX 2.0+ main connector -----> <--- ATX previous versions
> >> --->
> >>
> >> Pin Signal Color Pin Signal Color Pin Signal Color Pin
> >> Signal Color 1 +3.3VDC Orange 13 +3.3VDC Orange 1 +3.3VDC Orange
> >> 11 +3.3VDC Orange 2 +3.3VDC Orange 14 -12VDC Blue 2 +3.3VDC
> >> Orange 12 -12VDC Blue 3 COM Black 15 COM Black 3 COM
> >> Black 13 COM Black 4 +5VDC Red 16 PS_ON# Green 4
> >> +5VDC Red 14 PS_ON# Green 5 COM Black 17 COM Black
> >> 5 COM Black 15 COM Black 6 +5VDC Red 18 COM Black
> >> 6 +5VDC Red 16 COM Black 7 COM Black 19 COM Black
> >> 7 COM Black 17 COM Black 8 PWR_OK Gray 20 Reserved N/C
> >> 8 PWR_OK Gray 18 Reserved
> >> N/C (-5V)
> >> 9 +5VSB Purple 21 +5VDC Red 9 +5VSB Purple 19 +5VDC
> >> Red 10 +12V1DC Yellow 22 +5VDC Red 10 +12VDC Yellow 20
> >> +5VDC Red 11 +12V1DC Yellow 23 +5VDC Red
> >> 12 +3.3 VDC Orange 24 COM Black
> >>
> >> <--- ATX 2.0+ 12V for proc ------> <--- ATX previous versions
> >> --->
> >> Pin Signal Color Pin Signal Color Pin Signal Color Pin
> >> Signal Color 1 COM Black 3 +12V2DC Yellow/Black 1 COM Black
> >> 3 +12VDC Yellow 2 COM Black 4 +12V2DC Yellow/Black 2 COM Black
> >> 4 +12VDC Yellow
> >>
> >> Changes:
> >>
> >> 1) -5V removed, prev supplies probably had it. Usually not an issue.
> >> 2) Four addition pins on main connector. Extra +3.3V, +5V, +12V, GND
> >> Helps with PCI Express motherboards. For SLI boards, 24 pin
> >> recommended (to get two 6 amp pins to feed the two video cards via
> >> PCI Express slot connectors). For single video card, 20 pin is
> >> generally enough. 6600GT for example, draws 4 amps. Xbitlabs.com
> >> has measured many cards. If in doubt, do a detailed calculation.
> >> 3) 12V output split into two separate 12V circuits.
> >> No advantage to customer, due to need to allocate extra "slack"
> >> when buying. Perhaps intended to meet IEC60950 ? (To limit max
> >> power per 12V output) 12V1 feeds disks and motherboard (and video
> >> card) 12V2 used exclusively for processor (in your computer, that
> >> would be 8.24A)
> >>
> >> * 24 pin can plug to 20 pin mobo, as long as pins don't bump
> >> 20 pin can plug to 24 pin mobo (same pinout) - use the right holes.
> >> Some 24 pin are detachable, into a 20 pin part and a detached 4 pin
> >> part. At least one guy has managed to plug the detached 4 pin, into
> >> the processor Vcore input. (I haven't checked to see how hard that
> >> is to do.)
> >>
> >> PCI Express slots have 12V pins on them and allow up to 5 amps.
> >> Video cards (not overclocked) seem to be designed to draw about 4
> >> amps or a tiny bit more, through the PCI Express x16 slot. The
> >> single 12V wire on the 20 pin connector carries at least 6 amps, so
> >> using a 20 pin connector on a non-SLI board seems reasonable. The
> >> fan header current also flows through the single 12V pin on the 20
> >> pin connector. Main connector rated for 6 amps per pin.
> >>
http://www.molex.com/cgi-bin/bv/mole...roductID=98716
> >>
> >> 12V processor power connect pins rated at 8 amps per pin.
> >>
http://www.molex.com/cgi-bin/bv/mole...roductID=76873
> >>
> >> Molex disk drive connector rated at 8 amps per pin (based on assuming
> >> a right angle PCB mount connector, and 18 gauge wire - Amp 82181
> >> catalog)
> >>
> >> Enjoy your new power supply. No need for adapters.
> >>
> >> The Ultra you have selected, has 12V @ 16A. If you had an 89W AMD
> >> processor, that is (89W/12V)/0.90 = 8.24A. A midrange video card like
> >> 6600GT is 4A. That is 12.24 amps so far. A disk drive idles at 0.5A.
> >> A CDROM can draw 1.5A according to the rating on the label. Allocate
> >> 0.5A for some fans. We are now at 14.74 amps of 16A. Your new Ultra
> >> is suitable for a midrange gamer with minimal storage devices. More
> >> than 16 amps is required if your PC has more toys in it. For example,
> >> if you bought an ATI X1900XTX, it draws 10 amps (part through the
> >> PCI Express slot, part through the 2x3 PCI Express connector), and
> >> you would need about 12V @ 23A to have a stable computer. So, enjoy
> >> your new Ultra, but do not overload it.
> >>
> >> HTH,
> >> Paul
> >
> > Thanks for the detailed reply Paul.
> >
> > Just to confirm what you have said:
> >
> > 1. Plug the 20 pin ATX motherboard power cable into the 24pin socket
> > on the MB
> >
> > then...
> >
> > Sorry to be thick
> >
> > Thanks
> >
> > Pete
>
> Sorry Paul, I just noticed that the spec on the side of the box is different
> to the spec on their website.
>
> This is what it says on the box, is this better for me or worse?
>
> Thanks
>
> Pete
>
> +3.3VDC=16A
> +5vDC=30A
> +12vdc=19A 228W
> -12vdc=0.6A
> -5vdc=0.6A
> +5vsb=2.0A
>
>
>
>
>
>
> +3.3V
>
> AC INPUT
> 115V/230V 10A/6A 60/50Hz
> DC OUTPUT
> +3.3V
> +5V
> +12V
> -12V
> -5V
> +5VSB
> 500W
> Max
> Combined
> Watts
> 28A
> 30A
> 34A
> 0.8A
> 0.3A
> 2A
> 500W

If the link in question is this one, the 34A rating on 12V is plenty.
Just plug it in and use it :-)

http://www.ultraproducts.com/product...&productID=298

HTH,
Paul