23 pin PSU

[Pelu]

sup all... my PSU isnt booting... new one... i notice that in the motherboard power cable i only have 23 pins... the number 20 is missing... i change it or another one and same deal... the #20 pin is missing, my computer doesnt boot at all...

but my old PSU 24 pin one works fine!!! lol.. with all the 24 pins...

Its weird because 2 PSUs with 23 pins arent working and one a bit old one around 1 year or something is working fine with all the pins...

is there some secret to make this new PSUs work with only 23 pins?????

 

[Zap]

New power supplies no longer have -5v as specified since ATX 2.1. If you are trying to use an older motherboard that requires it, then you will have to find an older PSU design. Some are still being sold, such as the Thermaltake TR430. Those aren't that great for new systems, but work fine for older ones.

 

[Pelu]

let me check... the board is... M3A79-T Deluxe...

PSU is a Cooler Master 850W ... the form factor is V2.3...

the board in one of their manual pages mention something about specification v2.0....

I found this kinda weird because this board is for the new phenoms II and also take the phenom ones and everywhere is a drooling for its high friendship with the 4870 GPUS... so whats the matter here why they quit the v2.3 and go v2.0 lol....

 

[Pelu]

is there a way to make this work at all???? the this psu and the mobo.... this is the second psu i tried already..

 

[Pelu]

ok that does it.. this one doenst work anyway... I am going to return this to the store tomorrow and ask for a refund... I am really pissed because they told me all this PSUs they sold me are for my board.... and now i notice that they miss the -5 and they plainly dont work because of it... SCREW THAT!!!!

by the way i manage to dig out some info and I got one some spike in my spine... sounds like Intel is behind all this pin removal... why, because is unecessary that is right.... but AMD board use them... even some new AM3 use them...! now i see why they got removed, Intel want to screw up AMD as usual lol...

maybe soon we are going to start seen AMD PSUs and Intel PSUs... LOL!!!!!!!

 

[Zap]

Yes, Intel supports the ATX standards.

Strange that the AMD board doesn't work with those PSUs because they should. The -5v is for really REALLY old stuff, like old Pentium III or Athlons. Socket AM2 boards should be fine without -5v.

BTW, what are the wattages of all the power supplies besides the 850W Cooler Master? What parts are you trying to run off them? The reason I ask is because some higher wattage power supplies do not like too low of a load on the +12v. To give you a couple of examples that I came across personally...

I once tried to run a Core 2 Duo setup with a PCI video card on a BFG 1000W power supply, and it wouldn't turn on. The fans just start to turn and then it shuts off. I found out that if I added a bunch of fans to the system, it turned on just fine.

Just this past weekend I was playing around with a mini ITX board with an E5200 CPU and onboard video. Tried two power supplies, a BFG GS-650 and Corsair TX-650. Both did the same thing, fans just starting to move and it all shuts off. Put an old 200W power supply on it and it worked just fine.

So, what I'm suggesting is that you might be below the minimum power draw on the power supplies if all you are running is the CPU with integrated video. Try adding a bunch of fans to load up +12v, or adding a PCI Express video card (PCI doesn't use +12v).

 

[Quiksilver]

Sounds more like you just got a bad PSU.

 

[beray]

Originally posted by: Pelu
is there a way to make this work at all???? the this psu and the mobo.... this is the second psu i tried already..

Do what Zap said...

Switch mode power supplies required minimal current flow for proper function, else they shut themselves off or blow up. Typically for example from cross loading failure on monster size 12V single rail designs like this one --> http://c1.neweggimages.com/New...mage/17-171-017-04.jpg

Redistribute your power loading on the 12V taps, made sure to distribute your power evenly as much as possible across all 12V1, 12V2, 12V3, 12V4, etc... Usually you don't have to worry about 12V1, it's normally used for processor power.

 

[beray]

@Pelu

Use this literate 12V single rail PSU label as an example --> http://c1.neweggimages.com/New...mage/17-341-010-03.jpg

Note the pre-configured power distribution across 12V power taps on the lower left corner.