Question about ASUS P4B533 Motherboard

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I change the power supply but i have a little problem. The new one on the ATX power connector have only 19 pin then 20 old one plus extra 4 pin for something else. The new power supply in Rosewill RD400-2SB

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The extra 4 pins on the power supply's atx connector is for new motherboards that require 24pin power supplies. If your motherboard has a 20pin port, then only connect the 20pin portion of your power supply connector.

If your power supply has a 24pin fixed connector that can't be split into a 20+4pin configuration, and your motherboard doesn't have space to let the extra 4pins on the side, then you might want to consider returning the power supply and change it for one that can be used as a 20 or 24pin. Otherwise you will need to cut the extra 4pins apart.

Posted on Jan 05, 2009


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I need you to check something first.
I'm going to get detailed here to explain;

1) The Dell Dimension 1100 (B110) uses a 20-pin ATX main power cable,

The above is a STANDARD pinout for the wires going into a 20-pin ATX main power cable's connector.

For a time period Dell had parts made for their computers, that were PROPRIETARY.
(All pre-built computer manufacturers have their computer parts made by somebody else)

They were Proprietary, in that the STANDARD guidelines for desktop computers was NOT followed.
They had the wires changed around for the 20-pin ATX main power cable.

They also had the pins in the 20-pin ATX main power connector, on the motherboard, changed also.
Means if you plug in an aftermarket Power Supply, it may toast the motherboard, Processor, Ram Memory, Harddrive, graphics card, (IF used), and so on.

Fun stuff huh?
Dell changed from being Proprietary as far as I know.

However you computer may fall into the old proprietary parts.
You need to compare the 20-pin ATX main power cable's connector, of the old Power Supply, TO the new Power Supply's 20-pin ATX main power cable connector.

SEE if those wires (Color code) are going into the same socket holes, as the old one.
Look at the Lock on the side, and use it for the key.

In the Standard 20-pin ATX main power cable's connector, Number 1 pin is the Orange wire, and on the side OPPOSITE of the Lock.
Number 11 wire is also Orange, but is on the same side as the Lock.

Now you have the key, check out the old Power Supply's 20-pin ATX main power cable's connector.
Same color of wires going into the proper socket holes in the main power cable's connector?

Whew! Good! Let's go on.

You need to get the Power Supply going.

Bypass the Power On switch.

IF, you bypass the Power On switch, and the Power Supply comes on, you have a bad $5 Power On switch.

IF you bypass the Power On switch, and the Power Supply does NOT come on, you have a bad Power Supply.

Test has NOTHING to do directly with the Power On switch, or it's wires.
A jumper wire is used on the Soft Power On pin, TO ANY Black wire, in the 20-pin ATX main power cable's connector,

Looking back at the 20-pin ATX main power cable,

The GREEN wire is the Soft Power On wire.
A-N-Y Black wire you see is a Ground wire.

(The power wires are Positive wires. ALL Black wires are Negative wires )

The preferred jumper wire is a paper clip.
Straightened out, then bent into a U-shape.
The top of the U is wrapped a few times with black plastic electrical tape.
This taped area is for your fingers and thumb to hold onto.

Turn the U-shape upside down, and the 'Legs' are what you are going to use.
One leg goes down into a socket hole with the Green wire.
The other leg goes down into ANY socket hole that has a Black wire in it.

The 'Leg' of the jumper wire goes RIGHT NEXT TO the existing wire in the socket hole.
Where the wires go down into the connector of the 20-pin ATX main power cable, is the BACK.
The 20-pin ATX main power cable is plugged into the motherboard, as shown in the photo to the far right, in the Playtool link.

The jumper wire goes down into the Back of the connector, and into the two socket holes named above.
The jumper wire MUST go far enough down into the socket hole of the connector, to go PAST the insulation of the wire, AND touch the metal terminal at the end of the wire.

All wires going into the main power cable's connector, end in a metal terminal,

The left side is the Back, and the part that get's crimped on the insulation of the wire. The right side is the Front.
The Front of those Molex metal terminals can be seen in the center photo, of the Playtool link.

Contact made is no more than 2 seconds.
(The Power On switch is A Momentary Contact Switch)

Get the Power Supply going, then post back in a Comment, as to the results.

(Also make SURE the 4-pin ATX +12 Volt power cable is plugged in,

This is power for the Processor, and sometimes forgotten. NO, it has nothing to do with why the Power Supply does not come on. Just wanted to add.

This is where it plugs into the motherboard,

Processor and heatsink connector (J2E1) is where the Processor sits.
Processor power connector (J5B1) is where the 4-pin ATX +12 Volt power cable plugs in )

May I also ask why a new Power Supply was purchased, and a new motherboard?
Post back in a Comment.


Sep 19, 2012 | Dell Dimension 1100 PC Desktop

1 Answer

What power supply connector will work with the ms8137c motherboard (aka, 20 + 4 pin)

Ahem, you just posted 20 + 4-pin.

That means it can be a 20-pin ATX main power cable, OR a 24-pin ATX main power cable.

Most power supply's now have a 20 + 4-pin power cable.

Use the 20-pin connector, or add the additional 4-pin connector, to make a 24-pin ATX main power cable.


In direct answer to your question, however, it uses a 20-pin ATX main power cable.

For additional questions post in a Comment.

Jun 17, 2012 | Matsonic MS8137C Motherboard

1 Answer

Had to get a new power supply for my GT4016. When I got ready to hook up the motherboard power connector I realized the power supply has a 20 pin connector and the motherboard connector has 24 pins. Did...

on the part of the power supply there is another connection with 4 pins the 20 pin and the 4 pins click together then slot into motherboard thats usually wat the problem is theres AT and ATX motherboards see if you have those extra 4 pins hanging loose on the wires they slide into each other then into motherboard

Oct 09, 2011 | Gateway GT4016 Desktop PC

2 Answers

I've got a new Gigabyte Ga-M68Mt-D3 mobo paired with a cooler master 460 watt power supple. Cpu is Amd phenom II 3.2 ghz with 4 gig of DDR3 ram. I powered up the supply attached to my ATX power supply...

Most motherboards now have a 24-pin power supply connector. If you haven't already found a diagram showing the pinouts of the 20- and 24-pin power plugs, here's one borrowed from a handy site:


The two plugs are essentially the same, but the 24-pin version duplicates some voltages on the extra pins. The extra pins in the larger connector were meant to provide extra current paths for voltages that see heavy loads from newer processors and motherboard circuitry. Depending on how a motherboard is designed, it might work with a 20-pin plug connected (leaving pins 11, 12, 23 and 24 empty). But typically if the board has a 24-pin connector it needs the 24-pin power supply plug.

Most power supplies have a 20-pin plug with a separate 4-pin section that fastens to it for connection to a 24-pin mobo connector. It typically has one side designed to slide onto the end of the 20-pin plug, essentially turning it into the 24-pin version. This added plug does not have a retaining clamp on its side, so you can tell it from the the 4-pin CPU power plug. The wire colors are also different. For reference, here is the processor power plug, from the same website:

New motherboard specs call for the separate processor power connector for the same reason the extra pins were added to the power supply connector: to handle the high currents needed by increasingly faster CPUs.

When the motherboard has these connectors, you need to use them all to get everything working. Hope this helps. Thanks to for the diagrams, and thank you for using Fixya.


Nov 19, 2010 | Computers & Internet

1 Answer

My evolution 3000 been occasionally powering down for no apparent reason for a couple of weeks. now completely died. no power at all. won't switch on or show any life.

Power Supply's have a Form Factor. (Actually only motherboards do, but most Power Supply's follow the motherboard Form Factor)

The ATX designation determines it's size, shape, and factors concerning the various power cables coming out of it, (Spaghetti), plus other concerns.

An ATX power supply shape is generally close to 6 inches long, (15.24 Centimeters), 6 inches wide, and 3-1/2 inches tall.
(8.89 Centimeters)

It is the common size and shape used for 90 percent of the personal computers made, out there.

From what I have been reading about Evesham, they used typical power supply cables used for most ATX power supply's.

Basic specifications on the Evesham Evolution 3000 desktop computer,

Power Cables:

1) Don't know if the Power Supply will have a 20-pin ATX main power cable, or a 24-pin ATX main power cable.

In reality the point is moot, because new power supply's have a main power cable which will be a 20-pin connector, or a become a 24-pin connector.

To expound,

(If you scroll up the page, you can see a 24-pin ATX main power cable, and it's respective connector.

Scrolling further up produces a 20-pin ATX main power cable, and it's respective connector.

Color of the connector does not matter)

2) The Evesham Evolution 3000 specifications, state that an Intel Pentium 4 processor is used.

This means there will be a 4-pin ATX +12 Volt power cable, which plugs into the motherboard.


(Again, color of the connector does not matter)

3) There will be a few 4-pin Peripheral power cables,

One connects to the Harddrive, one connects to the Optical drive, (Or optical drives. Spec's state just one CD/DVD drive is used)

4) There is a Floppy Disk drive power cable,

(Again, I'm going off of the specifications stated. Your Evesham may not have a Floppy drive)

To be continued in a Comment.

Jun 15, 2010 | Evesham Evolution Blue Beast...

2 Answers

Not sure about upgrading power supply

In many cases the additional 4 pin section slides up and off of the main power plug for use in your particular unit.

Feb 20, 2009 | HP COMPAQ Presario SR5410F Pentium...

1 Answer

Hercules switching power supply 500 wat max

yes 20 pin connecter power supply is ATX(advance technology extended )power supply and old which was low watt and 24 pin is EATX (enhaunced advance technology extended) power supply is new and high watt so 4 pin connecter can be detached from 24 pin connecter and can be fitted in 20 pin connecter

Oct 18, 2008 | Guillemot Hercules Dual Fan ATX 450W Max...

1 Answer

Replacing a power supply.


You need to connect both 20-pin and 4-pin connector to *********** board. Your 4-pin connector is located between your CPU and a I/O connectors.

If you did it right first time, check if you have anything shorted on your board because your old P/S could go bad for reason.

Good luck!!!

Jun 20, 2008 | EliteGroup K8M800-M2 Motherboard

1 Answer

Power supply

ATX Version 1.2 - 20 wire motherboard connector Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 3.3V 3.3V Gnd 5V Gnd 5V Gnd P_OK 5VSB 12V Oran Oran Blk Red Blk Red Blk Gray Purp Yell Oran Blue Blk Green Blk Blk Blk White Red Red 3.3V -12V Gnd P_ON Gnd Gnd Gnd -5V 5V 5V Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 Pin 16 Pin 17 Pin 18 Pin 19 Pin 20 The color scheme used for the voltages in the 20 pin connector holds for the other ATX standard power supply connectors. However, brand name manufacturers often build proprietary power supplies or make up their own color coding, so I wouldn't throw out a power supply that supplies 5V where you think it should supply 3.3V. It's more likely a proprietary design than a failure.

Feb 21, 2008 | Computers & Internet

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