ATX 24 pin (aka BTX?)

merry · Dec 19, 2005, 12:44 PM

A friend purchased Gigabyte mobo - the GA-K8NMF-9. The dealer site (just as Gigabyte themselves) lists the board as ATX. But the mobo has a 24 pin connector... The ATX standard specifies a 20 pin connector.

Fortunately the manual includes a table of the connector signals - basically you can connect your 20 pin ATX PSU connector such as pin 1 connects to pin 1 in the mobo "ATX" connector. The signals appear to be identical with the BTX specs, except for the legacy -5V pin (not connected).

24 pin connector power supplies being unavailable where I'm from, could someone please confirm (from experience) that this is correct, i.e. using a 20 pin PSU pin1 to pin1 will work (or at least won't destry the mobo)?

Links:
http://www.giga-byte.com.tw/MotherBo...GA-K8NMF-9.htm
http://pinouts.ru/data/atxpower_pinout.shtml
http://pinouts.ru/data/btx_mbpower_pinout.shtml

The_Neon_Cowboy · Dec 19, 2005, 08:29 PM

The ATX 2.01 standard has 24 pins, basically it allows for you PSU to have
2 12 volt rails (I'm not going into dtail). Allows for alot of 12V power my 450W
ATX has 22A and my 450 ATX2 16A+17A =33A. Some mother boards will state
in thier manual if they will still allow you to use the STD 20 pin ATX connector,
but some boards do not....

PandaZ3 · Dec 23, 2005, 05:13 AM

I don't think you will hurt the Mobo as in burning it up, but it does use 24 pins fo better power distribution. That is what a Mobo does among others right? So you might hurt the performance of the board, or it may not give enough power to some component. Kinda like Neon Cowboy says, it is unclear.

I bet even in Romania they have some 24 Pin PSUs... somewhere.

soloz2 · Dec 26, 2005, 11:07 PM

no, you should be alright. The extra 4 pins are for 12v power so by using a 20pin psu on a 24pin mobo you may be underpowering your components.

there is an alternative, you can purchase a 20 to 24pin converter. While it is not as good as a native 24pin psu it is better than leaving the extra 4 pins blank (although this will work)

I'm not sure what Gigabyte's stance is, but according to Asus if you only have a 20 pin psu and a 24pin mobo your psu needs to be at least 500w

H3X4D3C1M4L · Dec 27, 2005, 03:51 AM

The extra pins are for 12V power to the PCI-e bus so as long as the GFX cards have their own plugs it should theoretically be fine

The_Neon_Cowboy · Dec 28, 2005, 12:56 AM

Quote:

Originally Posted by soloz2

no, you should be alright. The extra 4 pins are for 12v power so by using a 20pin psu on a 24pin mobo you may be underpowering your components.

there is an alternative, you can purchase a 20 to 24pin converter. While it is not as good as a native 24pin psu it is better than leaving the extra 4 pins blank (although this will work)

I'm not sure what Gigabyte's stance is, but according to Asus if you only have a 20 pin psu and a 24pin mobo your psu needs to be at least 500w

alot of board board don't require the 24 pin type , you just have
to check the motherboard manual...

the 20-24 pin adapter does nothing really to help your situation unless
you have a board that explicitly requires the 24 pin connector. When you
use it will be really hard on your PSU. so if you go thats route make sure
you have a good quailty PSU.

I used an adaptor on my rosewill for a while will my psu fan starts @ full speed then runs a tad louder. I just upgraded to a ATX 2.01 version thier not bad for $35

The thing about ATX 2.01 is the seprate 12V line "for you motherboard"
as in there are two seprate 12vot riails. IE my rosewill 450W supplies just
22A 12V but my rosewill atx 2.01 supplies
12v1/12v2
16A/17A
respectively thus a total of 33A 12V is available....

a bit noiseier....

Dec 19, 2005, 12:44 PM	#1
merry gargouille Join Date: Jun 2002 Location: sector ZZ9 Plural Z Alpha Posts: 962 Rep Power: 0	ATX 24 pin (aka BTX?) A friend purchased Gigabyte mobo - the GA-K8NMF-9. The dealer site (just as Gigabyte themselves) lists the board as ATX. But the mobo has a 24 pin connector... The ATX standard specifies a 20 pin connector. Fortunately the manual includes a table of the connector signals - basically you can connect your 20 pin ATX PSU connector such as pin 1 connects to pin 1 in the mobo "ATX" connector. The signals appear to be identical with the BTX specs, except for the legacy -5V pin (not connected). 24 pin connector power supplies being unavailable where I'm from, could someone please confirm (from experience) that this is correct, i.e. using a 20 pin PSU pin1 to pin1 will work (or at least won't destry the mobo)? Links: http://www.giga-byte.com.tw/MotherBo...GA-K8NMF-9.htm http://pinouts.ru/data/atxpower_pinout.shtml http://pinouts.ru/data/btx_mbpower_pinout.shtml __________________ There is a war between the ones who say there is a war and the ones who say there isn't. ~~Leonard Cohen

Dec 19, 2005, 08:29 PM	#2
The_Neon_Cowboy HardwareHeaven Extreme Member Join Date: Dec 2002 Location: U.S.A. Posts: 16,009 Rep Power: 92 System Specs	The ATX 2.01 standard has 24 pins, basically it allows for you PSU to have 2 12 volt rails (I'm not going into dtail). Allows for alot of 12V power my 450W ATX has 22A and my 450 ATX2 16A+17A =33A. Some mother boards will state in thier manual if they will still allow you to use the STD 20 pin ATX connector, but some boards do not.... __________________

Dec 23, 2005, 05:13 AM	#3
PandaZ3 HardwareHeaven Senior Member Join Date: Nov 2002 Location: Cornelius, Oregon Posts: 419 Rep Power: 0	I don't think you will hurt the Mobo as in burning it up, but it does use 24 pins fo better power distribution. That is what a Mobo does among others right? So you might hurt the performance of the board, or it may not give enough power to some component. Kinda like Neon Cowboy says, it is unclear. I bet even in Romania they have some 24 Pin PSUs... somewhere. __________________ It has to be Plugged In? To electricity? Video cards in house, 5770, 4650, HD 3870, X1950 XTX, X1900 XTX, X1900 XT and X1900 Crossfire, 2 X1800 XT's, X850 Pro, X800 Pro, AIW 9600XT, 9600 Pro, 9550 SE, 9200, 7000. XFX 6800 GS

Dec 26, 2005, 11:07 PM	#4
soloz2 DriverHeaven Addict Join Date: Mar 2005 Posts: 362 Rep Power: 0	no, you should be alright. The extra 4 pins are for 12v power so by using a 20pin psu on a 24pin mobo you may be underpowering your components. there is an alternative, you can purchase a 20 to 24pin converter. While it is not as good as a native 24pin psu it is better than leaving the extra 4 pins blank (although this will work) I'm not sure what Gigabyte's stance is, but according to Asus if you only have a 20 pin psu and a 24pin mobo your psu needs to be at least 500w __________________ [COLOR=gray][COLOR=red]CPU:[/COLOR] AMD Opteron 165 CCBBE @ 2.8Ghz [/COLOR] [COLOR=gray][COLOR=red]Motherboard:[/COLOR] DFI nF4 SLI-DR Expert [COLOR=red]Memory:[/COLOR] 2gb G.Skill F1-4000USU2-2 [COLOR=red]Video:[/COLOR] Asus 7900GT TOP @ 700/1700 [COLOR=red]Sound:[/COLOR] Modded X-Fi Elite Pro [COLOR=red]HD:[/COLOR] 2x Seagate 250Gb RAID 0, 1 Seagate 320Gb [COLOR=red]Optical Drives:[/COLOR] Sony DVD-Rom, Plextor 16x DVD DL RW [COLOR=red]Case:[/COLOR] CM Stacker [COLOR=red]PSU:[/COLOR] PC Power & Cooling Silencer 610 [COLOR=red]Cooling:[/COLOR] Custom Water [COLOR=yellow][COLOR=red]Keyboard/Mouse:[/COLOR] [/COLOR]Saitec Eclipse & Logitech MX518 with a Razer ExactMat mouse pad [COLOR=red]Sound:[/COLOR] Modded X-fi > Soloz Audio Silver IC > Maxed PIMETA > Beyer DT 770 Pro/80 cans [COLOR=red]HTPC:[/COLOR] [/COLOR][COLOR=gray]AMD 3800X2[/COLOR][COLOR=gray], Asus A8N-SLI Deluxe, G.Skill 2GB DDR400, MSI 6600GT, Haupauge PVR150, SB [/COLOR][COLOR=gray]Audigy 2ZS[/COLOR][COLOR=gray], Samsung 16x DVD DL RW, Sunbeam Nuuo PSU, Antec P180 case, AC Freezer64 Pro, Viewsonic N2750w LCD HDTV Heatware eBay [/COLOR]

Dec 27, 2005, 03:51 AM	#5
H3X4D3C1M4L DriverHeaven Extreme Member Join Date: May 2005 Posts: 6,794 Rep Power: 0	The extra pins are for 12V power to the PCI-e bus so as long as the GFX cards have their own plugs it should theoretically be fine