20-pin to 24-pin power adapter necessary?

All about them.

Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee

Post Reply
sundevil_1997
Posts: 255
Joined: Wed Apr 06, 2005 2:48 pm
Location: When it gets unbearably hot...you're there.

20-pin to 24-pin power adapter necessary?

Post by sundevil_1997 » Sun Jan 01, 2006 7:28 pm

My new motherboard is on the way, and I've discovered that not only do I not have any power supplies that have a 24-pin connector, but the motherboard is not coming with one either.

From what I understand, isn't the 24 pin connector just the regular 20-pin connector with the 4-pin ATX power connector tacked on the end?? If that's true, do I really need an ADAPTER? Or can I just connect the two seperate plugs into the 24-pin connector on the motherboard? I may have to shave some plastic off the connectors so they fit close, but is that all?
SPCR: Boldly covering the broad range between "quiet" and "silent".
As a result of finding this site, my computer isn't any quieter...but at least I'm much more aware of it.

NeilBlanchard
Moderator
Posts: 7680
Joined: Mon Dec 09, 2002 7:11 pm
Location: Maynard, MA, Eaarth
Contact:

Post by NeilBlanchard » Sun Jan 01, 2006 7:34 pm

Greetings,

I dunno, but a 20 to 24 pin adaptor only cost me like $7-8 at MicroCenter...it worked fine. Because, I think the 4 pin connector was also used on that particular motherboard, so you c/should not run without it?
Sincerely, Neil
http://neilblanchard.blogspot.com/

Elixer
Posts: 520
Joined: Wed Jun 02, 2004 10:31 am
Location: Las Cruces, NM
Contact:

Re: 20-pin to 24-pin power adapter necessary?

Post by Elixer » Sun Jan 01, 2006 10:17 pm

sundevil_1997 wrote:From what I understand, isn't the 24 pin connector just the regular 20-pin connector with the 4-pin ATX power connector tacked on the end?? If that's true, do I really need an ADAPTER? Or can I just connect the two seperate plugs into the 24-pin connector on the motherboard? I may have to shave some plastic off the connectors so they fit close, but is that all?
No, although the extra 4 wires on the 24 pin connector carry 12V lines, they aren't the same configuration as the 4 pin 12V connector. You won't be able to connect the two connectors to the 24 pin on the motherboard, and shouldn't even if you were able to.

As far as needing the converter, some people have had success with just plugging in the 20 pin into the 24 pin on the motherboard and leaving the 4 pins open. Some motherboards work fine, some are unstable, and some don't post. It's worth trying before you invest in an adapter, but the converter will almost certainly give you more stability and room to overclock.

Tephras
Posts: 1140
Joined: Tue Sep 07, 2004 11:03 am
Location: Europe

Re: 20-pin to 24-pin power adapter necessary?

Post by Tephras » Sun Jan 01, 2006 10:28 pm

sundevil_1997 wrote:From what I understand, isn't the 24 pin connector just the regular 20-pin connector with the 4-pin ATX power connector tacked on the end??
Nope, the four added pins are +12, +5, +3.3 and ground. They were added to support PCI Express, power supplies with the 24-pin ATX power cable still has a 4-pin +12V power cable but it has a separate current limit.

teknerd
Posts: 378
Joined: Sat Nov 13, 2004 5:33 pm

Post by teknerd » Mon Jan 02, 2006 12:32 am

Tephras is exactly right.
You don't need a convertor unless you are using a high draw VGA card.
Do not under any circumstances try and fit the 12V ATX connector into the last four pins on the 24 Pin ATX connector slot.
[img]http://tinyurl.com/rqlff[/img]
[size=75]Main Rig: X2-4200+ | XP-120 | A8N-SLI Premium | 2GB RAM | XFX 6600GT w/VF700 | 74GB Raptor & 320GB 3200JD | P180 | SmartPower II 500W | 2x Dell 1704FPV (Digital)
Media Center: Athlon XP-M 2500+ @ 2.2GHz | ALX800 w/92mm Panaflo | 1GB RAM | 40GB WD | SLK3000B | Modulated, Fan-Swapped 380S PSU
[/size]

dddibley
Posts: 194
Joined: Tue Nov 29, 2005 5:19 pm
Location: British Columbia

Post by dddibley » Mon Jan 02, 2006 2:01 am

Some Intel boards.. and others I would imagine.. have the 2x2-12v and a molex for older PSUs.

Intel Desktop Board D925XECV2

ddd
[size=75][i]Sonata II, SP-450W, P4P800SE, Prescott 3.0E (7000B AlCu), 2x512 Infineon OEM, ATI X800XL 256 VIVO, PVR-250, Samsung 913v II, 60GB WD, 80GB Samsung, FanMaster, DVD16DL, DVDROM, SoundMax, XP Pro[/i][/size]

MiKeLezZ
Posts: 110
Joined: Sun Feb 20, 2005 8:00 am
Location: ITALY
Contact:

Post by MiKeLezZ » Wed Jan 04, 2006 1:49 am

I'm using a 20 pin with a 7800GT
You don't need to use it
[color=#009999]PC1: E8400 on HD5770 | PC2: P8400 on GM45 | PC3: 5050E on 760G | PC4: M740 on GMA900[/color]

sundevil_1997
Posts: 255
Joined: Wed Apr 06, 2005 2:48 pm
Location: When it gets unbearably hot...you're there.

Post by sundevil_1997 » Wed Jan 04, 2006 11:19 am

MiKeLezZ wrote:I'm using a 20 pin with a 7800GT
You don't need to use it
thanks for all the helpful replies! I finally got the board, and in the instructions, it actually says you can plug a regular 20-pin power connector into it. :roll: You were all correct! Thanks again.
SPCR: Boldly covering the broad range between "quiet" and "silent".
As a result of finding this site, my computer isn't any quieter...but at least I'm much more aware of it.

Smithore
Posts: 10
Joined: Wed Jun 15, 2005 7:07 am
Location: Dallas, TX

Post by Smithore » Thu Jan 19, 2006 10:27 pm

So to piggy-back on this thread, I bought a Seasonic PSU to power my P4 2.4 machine with an ASUS P4S8X motherboard. It turns out my mobo only has 20 pins, while the PSU has 24. This is the opposite situation as the original poster. Do I need to purchase an adapter, or can I just plug the 24-pin PSU into the 20 pin slot on the mobo, letting the bottom 4 pins from the PSU hang free?

dddibley
Posts: 194
Joined: Tue Nov 29, 2005 5:19 pm
Location: British Columbia

Post by dddibley » Thu Jan 19, 2006 10:46 pm

They make adapters for just about anything.. although a lot of PSUs are 20+4 pin. The end (2x2) doesn't slide or snap off? If it actually fit on your board without interference, it should work. My unattached +4 is just hanging there.

What model Seasonic is that ?

ddd
[size=75][i]Sonata II, SP-450W, P4P800SE, Prescott 3.0E (7000B AlCu), 2x512 Infineon OEM, ATI X800XL 256 VIVO, PVR-250, Samsung 913v II, 60GB WD, 80GB Samsung, FanMaster, DVD16DL, DVDROM, SoundMax, XP Pro[/i][/size]

Smithore
Posts: 10
Joined: Wed Jun 15, 2005 7:07 am
Location: Dallas, TX

Post by Smithore » Thu Jan 19, 2006 10:50 pm

dddibley wrote:The end (2x2) doesn't slide or snap off?

What model Seasonic is that ?
Oh god, I'm such a newb! :D Yes, the 4 pins slide off the end, and I assume that 2x2 plugs into the other ATX power slot on the mobo somewhere? Wow, I suck.

The Seasonic I bought is the S12-380.

Tephras
Posts: 1140
Joined: Tue Sep 07, 2004 11:03 am
Location: Europe

Post by Tephras » Fri Jan 20, 2006 12:17 am

Nope, you should not plug in the 2x2 connector, let it hang.

sundevil_1997
Posts: 255
Joined: Wed Apr 06, 2005 2:48 pm
Location: When it gets unbearably hot...you're there.

Post by sundevil_1997 » Fri Jan 20, 2006 1:17 am

Smithore wrote:Oh god, I'm such a newb! :D Yes, the 4 pins slide off the end, and I assume that 2x2 plugs into the other ATX power slot on the mobo somewhere? Wow, I suck.
The 2 X 2 that disconnected from the other 20 pins is NOT the same as the 2 X 2 ATX12V power connector. Yet another brilliant stroke of confusion and ambiguity by PSU and motherboard manufacturers.....
SPCR: Boldly covering the broad range between "quiet" and "silent".
As a result of finding this site, my computer isn't any quieter...but at least I'm much more aware of it.

dddibley
Posts: 194
Joined: Tue Nov 29, 2005 5:19 pm
Location: British Columbia

Post by dddibley » Fri Jan 20, 2006 1:19 am

Like Tephras states.. the 20+4 (2x2 main connector) is different than the 2x2-12v auxillary connector. That one should be on a long lead by itself. The connector is to the lower left of the CPU socket in the picture. There appears to be a molex connector too.

P4S8X 12v aux connectors

ddd
[size=75][i]Sonata II, SP-450W, P4P800SE, Prescott 3.0E (7000B AlCu), 2x512 Infineon OEM, ATI X800XL 256 VIVO, PVR-250, Samsung 913v II, 60GB WD, 80GB Samsung, FanMaster, DVD16DL, DVDROM, SoundMax, XP Pro[/i][/size]

Smithore
Posts: 10
Joined: Wed Jun 15, 2005 7:07 am
Location: Dallas, TX

Post by Smithore » Fri Jan 20, 2006 6:11 am

Ahhhh, right as usual guys. Thanks for clearing up the confusion, I get it now.

I think my last problem is going to be trying to route the power cable from the Seasonic around the giant Thermalright heatsink. I'm not sure there's enough cable, but we'll see what happens. Thanks again!

Post Reply