How many pins does the cpu auxiliary power connector on a motherboard have?

The 24 pin main power connector was included in ATX12V 2.0 to carry out added power required by PCI Expush slots. The older 20 pin main power cable just has one 12 volt line. The new 24 pin connector added one line aitem for ground, 3.3, 5, and 12 volts. The added pins made the auxiliary power cable uncrucial so many ATX12V 2.x power provides don"t have actually them. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction.

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PinoutPins 1 with 12Pins 13 with 24DescriptionWire colorPin numberPin numberWire colorDescription
+3.3 voltsorange113orange+3.3 volts
+3.3 voltsorange214blue-12 volts
groundblack315blackground
+5 voltsred416greenPS_ON#
groundblack517blackground
+5 voltsred618blackground
groundblack719blackground
PWR_OKgray820white-5 volts (optional)
VSB +5 voltspurple921red+5 volts
+12 voltsyellow1022red+5 volts
+12 voltsyellow1123red+5 volts
+3.3 voltsorange1224blackground

A few of the voltage lines on the connector may have smaller sense wires which permit the power supply to feeling what voltage is actually viewed by the motherboard. These are pretty widespread on the 3.3 volt line in pin 13 but are periodically offered for various other volteras too. The -5 volt line on pin 20 was made optional in ATX12V 1.3 (presented in 2003) bereason -5 had actually been seldom offered for years. Newer motherboards virtually never before call for -5 volts but many kind of older motherboards execute. Many more recent power offers do not carry out -5 volts in which case the white wire is lacking.

Unmain cable/connector maximum wattage delivery for primary railsVoltage railNumber of linesMaximum currentMaximum wattage
+3.3 volts424 amps79.2 watts
+5 volts530 amps150 watts
+12 volts212 amps144 watts

If you have actually an ATX power supply through a 24 pin main cable, it"s okay to plug it into a motherboard through a 20 pin connector. It was designed to work-related that way. You can watch an example in the image over. The additional 4 pins on the cable just hang over the end of the motherboard connector. The 24 pin cable just fits into a 20 pin socket at one finish so you can"t plug it in wrongly. The extra 4 pins were added to the 24 pin variation of the cable to provide one extra wire for ground, 3.3, 5, and also 12 volts. But it"s okay to leave those 4 pins disassociated bereason a motherboard through a 20 pin connector does not need them. The only trouble you deserve to bump into (literally) is if tright here is somepoint blocking the spot wright here the 24 pin cable hangs over the finish. Or occasionally the end of the 20 pin motherboard connector is also thick to fit in between the pins of the 24 pin cable. You have the right to solve that difficulty by very closely shaving down one finish of the 20 pin motherboard connector. It"s simply plastic. You won"t miss out on it. If you can"t acquire them to fit together then you have the right to obtain an adapter cable which will certainly make it work. The 24 pin cable plugs into one finish of the adapter and then the adapter plugs into the 20 pin motherboard. But you should avoid making use of that type of adapter if you have the right to because the extra wire and connector are simply more points which can go wrong. Adapters additionally slightly rise the voltage drop which is somepoint worth staying clear of. It"s much better to first view if you deserve to acquire a 24 pin cable to fit into a 20 pin motherboard before resorting to an adapter.

ATX 20+4 Pin Key Power Cable Connector

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Motherboards have the right to come through either a 20 pin major power connector or a 24 pin major power connector. Many power offers come with a 20+4 cable which is compatible via both 20 and 24 pin motherboards. A 20+4 power cable has two pieces: a 20 pin piece, and also a 4 pin item. If you leave the two pieces separate then you deserve to plug the 20 pin piece into a 20 pin motherboard and also leave the 4 pin item unplugged. Be sure to leave the 4 pin piece unplugged also if it fits right into an additional connector. The 4 pin item is not compatible with any kind of other connectors. If you plug the two pieces of a 20+4 power cable together then you have a 24 pin power cable which have the right to be plugged into a 24 pin motherboard.

8 Pin EPS +12 Volt Power Cable Connector

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This cable was initially produced for workstations to administer 12 volts to power multiple CPUs. But as time has passed many type of CPUs call for even more 12 volt power and the 8 pin 12 volt cable is regularly provided rather of a 4 pin 12 volt cable. Depfinishing on the power supply, the connector might contain one 12 volt rail in all 8 pins or 2 12 volt rails taking up 4 pins aitem. It is regularly refered to as an "EPS12V" cable.

The 8 pin 12 volt cable is polarized so it deserve to just be plugged right into the 8 pin motherboard connector effectively. If you look closely at the picture over you have the right to see that four of the pins are square and also the various other 4 have rounded corners. The motherboard connectors likewise have actually the exact same square and also rounded plan so the power cable only fits in one means. At least that"s true unmuch less you attempt really difficult to force it into the connector. With enough pressure you can occasionally acquire a cable through a little variety of pins right into a connector which does not enhance. The 8 pin cable has actually sufficient pins that it"s pretty tough to insert it in the wrong direction but figured out world can be able to execute it. If you look very closely you deserve to likewise see that the square and rounded pattern matches assorted positions on other motherboard connectors like the 20 pin main power connector and also 24 pin primary power connector. You need to just plug the 8 pin 12 volt cable right into the motherboard connector wright here it belongs unless you enjoy the smell of fried electronics.

You have the right to also plug an 8 pin 12 volt cable right into a 4 pin 12 volt motherboard connector. I don"t have actually a picture of this one however it looks comparable to this. Four of the pins on the 8 pin cable fit right into the motherboard connector and the various other four pins hang off the end. The 8 pin cable just fits right into one finish of the 4 pin motherboard connector unless you try difficult to force it right into the wrong position. The 8 pin cable is electrically compatible yet it may not fit right into a 4 pin motherboard. There is frequently a component which blocks the location where the 4 pins would hang off the end. And sometimes the plastic end of the 4 pin connector is as well thick to fit in between the pins of the 8 pin cable.

Make sure that you do not try to plug an 8 pin 12 volt cable right into the 8 Pin PCI Express power connector on a video clip card. The two cables look incredibly similar so it"s basic to obtain the two puzzled. 8 Pin PCI Express power cables are generally laberesulted in differentiate them from 8 pin 12 volt cables. The PCI Express cable normally has "PCI-E" printed on the connector. If tright here are no labels then you can usually usage wire colors to tell the two kinds of cables apart. An 8 pin 12 volt cable has actually yellow wires on the same side as the connector clip. An 8 Pin PCI Expush cable has babsence wires on the clip side. The two power cables are additionally keyed in a different way so you can"t plug one type of power cable right into the various other kind of connector. But as through this type of connector, you deserve to periodically force the wrong type of cable right into a connector if you push difficult sufficient. Make sure you have actually the appropriate kind of cable before plugging it in. The two are absolutely not compatible via each various other.

PinoutPins 1 with 4Pins 5 through 8DescriptionWire colorPin numberPin numberWire colorDescription
groundblack15yellow+12 volts (12V1)
groundblack26yellow+12 volts (12V1)
groundblack37yellow+12 volts (12V1 or 12V2)
groundblack48yellow+12 volts (12V1 or 12V2)

Unmain cable/connector maximum wattage deliveryVoltage railNumber of linesMaximum currentMaximum wattage
+12 volts428 amps336 watts

If you don"t have an 8 pin 12 volt cable then you deserve to use the adapter presented above. It converts a pair of 4 pin peripheral power cables right into an 8 pin 12 volt cable. If you usage one of these adapters then be sure to plug the 4 pin peripheral connectors into separate cables coming from the power supply. If you plug them both right into the exact same power supply cable then you are illustration all the power of the 8 pin 12 volt connector via a single 18 gauge wire. You have the right to often get amethod via that however there"s no reason to do it.

4+4 Pin +12 Volt Power Cable Connector

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Motherboards deserve to come with either a 4 pin 12 volt connector or an 8 pin 12 volt connector. Many power gives come with a 4+4 pin 12 volt cable which is compatible via both 4 and 8 pin motherboards. A 4+4 power cable has 2 separate 4 pin pieces. If you plug the two pieces of a 4+4 power cable together then you have actually a 8 pin power cable which deserve to be plugged into an 8 pin 12 volt connector. If you leave the two pieces sepaprice then you have the right to plug among the 4 pin pieces right into a 4 pin 12 volt connector and also leave the various other 4 pin item unplugged.

If you look carefully at the image above then you have the right to check out the polarization of the pins which prevents you from plugging the cable in imcorrectly. A few of the pins are square and also some of them have actually rounded off corners. The motherboard connectors have equivalent square and rounded off corners to proccasion the cable from being plugged in the wrong method. But if you look really carefully at the appropriate half of this certain cable and also then look at the 8 pin 12 volt cable pictured over you"ll notice that they don"t enhance. A regular 8 pin cable has 4 square pins and also four rounded ones however the 4+4 cable presented above has 2 square pins and 6 rounded ones. The left half of the 4+4 matches the left fifty percent of an 8 pin cable but the appropriate half is various. Hmmmm... And this isn"t some bizarre cable either. I"ve checked out plenty of 4+4s which look prefer this one. And then there are other 4+4 cables which look just prefer an 8 pin cable split in two (which makes sense). Because rounded pins fit right into square holes in motherboard connectors, this specific cable will certainly fit simply fine right into an 8 pin 12 volt motherboard connector. But both halves of this 4+4 will fit right into a 4 pin 12 volt motherboard connector. You"re intended to usage the left half of the cable presented above as soon as plugging it into a 4 pin motherboard connector but the best half will certainly additionally fit. As it happens, either fifty percent will work-related fine in a 4 pin motherboard because both halves of the 4+4 simply carry out 12 volts. The pinouts are the exact same for both halves so either one will work. I"m not certain why they make cables prefer this one bereason you"d number a 4+4 cable would just be an 8 pin cable which splits in two. And you just require one fifty percent of a 4+4 cable to plug into a 4 pin motherboard. The other half is unsupplied. But the sort of 4+4 cable displayed over is pretty common so don"t let it throw you.

6 Pin PCI Express (PCIe) Power CableConnector

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This cable is used to administer additional 12 volt power to PCI Expush development cards. PCI Expush motherboard slots can provide a maximum of 75 watts. Many kind of video cards attract significantly even more than 75 watts so the 6 pin PCI Express power cable was produced. These high-power cards attract the majority of of their power from the 12 volt rail so this cable gives just 12 volts. These are occasionally referred to as "PCI Express cables". They are also occasionally called "PEG cables" wbelow "PEG" means PCI Express Graphics. If your power supply does not have actually a 6 pin PCI Express cable then you deserve to usage the adapter displayed above on the appropriate to transform two 4 pin peripheral cables right into a PCI Express cable. If you use an adapter then be certain to plug the 4 pin peripheral connectors into sepaprice cables coming from the power supply. If you plug them both into the very same power supply cable then you are drawing all the power of the PCI Expush connector via a solitary 18 gauge wire. You can normally gain ameans with that yet there"s no reason to carry out it. The PCI Express 6 pin connector is polarized so it can only be plugged in pointing in the correct direction. But as through connectors of this form, you have the right to periodically pressure them into the wrong kind of socket if you try hard enough. If it does not slide in conveniently then you"re more than likely plugging it into the wrong location.

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Some video cards come via the 8 pin PCI Expush power connector to assistance higher wattage than the 6 pin PCI Express connectors. It"s okay to plug a 6 pin PCI Expush power cable right into an 8 pin PCI Expush connector. It"s designed to occupational that means but will certainly be restricted to the lower wattage offered by the 6 pin variation of the cable. The 6 pin cable only fits right into one end of the 8 pin connector so you can"t insert it incorrectly however you can periodically pressure the 6 pin cable in the wrong method if you attempt difficult sufficient. Video cards have the right to feeling whether you have actually plugged a 6 pin or 8 pin cable into an 8 pin connector so the video card deserve to impose some type of restriction once running with only a 6 pin power cable. Some cards will certainly refusage to run with only a 6 pin cable in an 8 pin socket. Others will work-related with a 6 pin cable at normal speeds yet will certainly not permit overclocking. Check the video card documentation to gain the rules. But if you do not have actually any kind of various other indevelopment then simply assume that if your video card has actually an 8 pin connector then you must plug in an 8 pin cable.

PinoutPins 1 with 3Pins 4 with 6DescriptionWire colorPin numberPin numberWire colorDescription
+12 voltsyellow14blackground
+12 volts or not connectedyellow or not connected25blackground
+12 voltsyellow36blackground

Official cable/connector maximum wattage deliveryVoltage railNumber of linesMaximum currentMaximum wattage
+12 volts32.083 amps75 watts

The PCI Express specification is, unfortunately, not a complimentary, public specification. So the majority of human being have actually never seen it. Including me. ATX specification: openly available to all. PCI Expush specification: expensive so hardly anyone has actually seen it. ATX: excellent. PCI Express: negative. It"s a shame when a extensively supplied traditional isn"t easily obtainable to the public. Nonethemuch less, indevelopment leaks out from the specification and the 6 pin PCI Expush power cable is actually rated at a very conservative 75 watts. I have actually no idea why the wattage is rated so low bereason the specifications from Molex clearly allow considerably even more power. Part of the reason may be that pin 2 (provided above as a 12 volt line) might be noted as not linked in the specification. I"ve never seen a 6 pin PCI Expush power cable with pin 2 not associated. They"ve all had actually a 12 volt line connected to pin 2. I"ve also viewed clintends that tbelow may be unimposed feeling lines in the specification. Welinvolved the uncertainty which happens once you don"t have actually easily easily accessible specifications. Even via just two 12 volt lines the traditional implementation of PCI Express power cables use huge sufficient gauge wire and a good sufficient connector to carry out a lot even more than the three amps per wire required to carry out 75 watts. Nonetheless, the 6 pin PCI Express power cable officially gives just 75 watts. In all likelihood, but, actual implementations of this power cable have the right to administer much more than 75 watts.

8 Pin PCI Express (PCIe) Power Cable Connector

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The PCI Expush 2.0 specification released in January 2007 added an 8 pin PCI Express power cable. It"s just an 8 pin variation of the 6 Pin PCI Express power cable. Both are mainly supplied to carry out supplepsychological power to video cards. The older 6 pin variation officially provides a maximum of 75 watts (although unofficially it can usually provide a lot more) whereas the brand-new 8 pin variation gives a maximum of 150 watts. It is extremely simple to confuse the 8 pin version with the exceptionally similar-looking EPS 8 pin 12 volt cable.

The 8 pin PCI Expush and the EPS 8 pin 12 volt connectors are polarized in a different way so you won"t be able to plug one sort of cable into the other type of connector. That is, you will not have the ability to plug the wrong kind of cable in unless you attempt really hard. Unfortunately, the Molex Mini-fit Jr. connectors provided by both kinds of power cables can sometimes be compelled right into a differently-polarized connector if they only have a few pins and also you press hard enough. If the cable won"t slide in conveniently then you"re most likely trying to insert the wrong sort of cable. The 8 pin PCI Express connector does have a little plastic bridge which prevents it from being plugged right into an EPS 8 pin 12 volt motherboard connector. You have the right to watch the bridge in the picture over between the rightmany 2 pins in the height row of the connector. But there"s no such security to proccasion EPS 8 pin 12 volt cables from being plugged into an 8 pin PCI Expush connector on a video card. That combination might fit if you shove tough enough. And if you plug in the wrong kind of cable then intend fireworks. Several of the grounds and also 12 volts wires for an EPS 8 pin 12 volt are reversed compared to an 8 pin PCI Expush. Fortunately, most 8 pin PCI Express connectors are labeled "PCI-E" so world won"t confusage them through EPS 8 pin 12 volt cables. If the connectors aren"t labeled then you deserve to tell an 8 pin PCI Express power cable from an EPS 8 pin 12 volt cable by checking the color of the wires which plug right into the clip side of the connector. On the EPS 8 pin cable, the yellow wires (the 12 volt wires) go into the clip side of the connector. On the 8 pin PCI Expush cable, the wires on the clip side are all babsence (grounds). That"s the exact same as it is through the 6 Pin PCI Express power cable. Of course, namong this helps you if your cable supplies the trendy all-the-same-color-wires architecture which is renowned through high-fashion power offers. In that situation you"ll just have to be extremely careful or hope the connectors are labeled.

PinoutPins 1 with 3Pins 4 via 6DescriptionWire colorPin numberPin numberWire colorDescription
+12 voltsyellow15blackground
+12 voltsyellow26blackground
+12 voltsyellow37blackground
groundblack48blackground

Connector component numbersVideo card connectorCable connectorTerminalsMaximum existing per circuit
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Official cable/connector maximum wattage deliveryVoltage railNumber of linesMaximum currentMaximum wattage
+12 volts34.167150 watts

6+2 Pin PCI Expush (PCIe) Power Cable Connector

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Some video cards have actually 6 Pin PCI Express power connectors and others have actually 8 Pin PCI Expush power connectors. Many type of power supplies come with a 6+2 PCI Expush power cable which is compatible via both kinds of video cards. The 6+2 PCI Expush power cable is consisted of of 2 pieces: a 6 pin item, and also a 2 pin piece. If you put the 2 pieces together then you have actually a full 8 pin PCI Express power cable. But if you separation the connector into 2 components then you can plug the 6 pin part into the older 6 pin PCI Expush connector and leave the 2 pin component unplugged. That way, your power supply just demands to have one 6+2 cable to be compatible with both 6 pin and also 8 pin PCI Expush connectors.

4 Pin Peripheral Power Cable Connector

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The four pin peripheral power cable days ago to the original COMPUTER. It was provided for floppy drives and difficult disks. It"s still roughly and also is currently likewise supplied for all kinds of things consisting of add-on fans, extra video card power, supplemental motherboard power, and situation lighting. It"s as old as the hills yet is still incredibly commonly supplied. The connector is shaped so that it just fits in one means. You do not need to issue around inserting it the wrong means. People often usage the term "4 pin Molex power cable" or "4 pin Molex" to describe a four pin peripheral power cable. It"s not a technically beneficial term because the 4 pin 12 volt cable is also a 4 pin Molex cable (Molex provides several connectors) however "4 pin Molex" is generally used to refer to peripheral cables anymethod.

PinoutPin numberWire colorDescription
1yellow+12 volts
2blackground
3blackground
4red+5 volts

Connector component numbersSocket housingSocketPin housingPinMaximum present per circuit
AMP 1-480424-0AMP 60619-1AMP 1-480426-0AMP 60620-113 amps

I don"t know of any kind of main interpretation of the maximum current enabled in a peripheral cable. The connector can take care of 13 amps according to the manufacturer. But you normally find 18 awg wire in the peripheral cables. If you have actually an 18 inch cable (about a fifty percent a meter) and also are running 13 amps through 18 gauge wire then you acquire a voltage drop of around 0.25 volts counting both the power wire and the ground (it"s gained to go both ways) and the dissipation is about 3.3 watts. That"s not good. I"ve just played it safe and also provided the maximum present as 5 amps.

Unofficial cable/connector maximum wattage deliveryVoltage railNumber of linesMaximum currentMaximum wattage
+5 volts15 amps25 watts
+12 volts15 amps60 watts

Current power supplies generally have actually at least 2 separate peripheral power cables, each of which has actually two or even more peripheral connectors. When you"re plugging in multiple high powered gadgets it"s a great principle to spreview the fill in between every one of your cables. Don"t just plug all your devices right into one cable unless they"re reasonably low load tools. Spanalysis the present in between the cables reduces the voltage drops and power loss. If they"re relatively low existing gadgets prefer fans or it"s simply a disk drive or two then it does not really matter. But if you"re putting lots of tough disks into a computer (some deserve to draw practically 3 amps at 12 volts when doing some operations) or connecting a video card"s auxiliary power, then spreview the loads between the peripheral power cables. It"s also helpful if you usage a connector as close to the PSU as feasible fairly than sticking points at the finish of the cable. Extra wire just suggests even more voltage drop. And if you"re using a peripheral connector to PCI Express adapter then be sure to plug each of the adapter"s peripheral connectors into a sepaprice PSU cable. They offered you 2 peripheral connectors for a factor. Plugging them both right into the very same PSU cable forces your video card to attract its 12 volt power through one 18 gauge wire. That boosts your voltage drop and also power dissipation in the cable. Some existing high-finish video cards deserve to suck up even more than 10 amps at 12 volts with most of it coming through the PCI Express connector so it pays to be cautious. It will most likely work-related if you do not spcheck out the pack yet there"s no excuse for not doing it correctly. They offered you multiple cables. You might too use them. Plus there"s just somepoint creepy about having actually warm wires even if they"re not melting.

You will certainly sometimes run into peripheral connectors which don"t have all four wires. They are usually 12 volt just cables intfinished for fans. Never before plug among those right into a disk drive. Drives intend both 5 and also 12 volts to be gave. A few of the two-wire peripheral connectors are for speed-managed fans. That suggests that the voltage transforms depending on the preferred fan rate. The connector will certainly only provide 12 volts when the fan is going complete rate and the voltage decreases to slow the fan dvery own. Definitely do not plug that one into anypoint but a fan! Normally this sort of peripheral connector has actually "fan" printed on it to warn you. As lengthy as a peripheral connector has four wires: one yellow, two babsence, and one red and also it does not have some kind of published warning attached then it"s a standard peripheral cable and also you deserve to plug it right into anything.

SATA Power Cable Connector

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SATA was presented to upgrade the ATA interface (additionally called IDE) to an extra progressed architecture. SATA has both a data cable and also a power cable. The power cable reareas the old 4 pin peripheral cable and adds assistance for 3.3 volts (if totally implemented). The connector is shaped so it can just be plugged in the correct way.

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PinoutPin numberWire numberWire colorDescription
15orange+3.3 volts
25orange+3.3 volts
35orange+3.3 volts
44blackground
54blackground
64blackground
73red+5 volts
83red+5 volts
93red+5 volts
102blackground
112blackground
122blackground
131yellow+12 volts
141yellow+12 volts
151yellow+12 volts

Connector part numbersCable connectorTerminalsMaximum present per circuit
Molex 67582-0000Molex 67581-00001.5 amps

Official cable/connector maximum wattage deliveryVoltage railNumber of linesMaximum currentMaximum wattage
+3.3 volts34.5 amps14.85 watts
+5 volts34.5 amps22.5 watts
+12 volts34.5 amps54 watts

You need to be mindful about SATA power cables. Several of them are lacking the 3.3 volt wire. People via older power gives regularly use adapters which convert from 4 pin peripheral cables to SATA power cables. But considering that 4 pin peripheral connectors only supply 5 and 12 volts, the SATA connector is absent 3.3 volts (there"s no orange wire). Tbelow are also a couple of older power supplies which inexplicably have SATA power cables which are absent the 3.3 volt wire. At this time, SATA drives seldom use 3.3 volts. That might be bereason tbelow are as well many kind of human being making use of adapters so the drive equipments don"t desire the headaches which come with using 3.3 volts. But in the future, 3.3 volt drives may end up being common so you should be careful once making use of SATA power cables which do not implement 3.3 volts.