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Overclock.net - Overclocking.net > Case Mods & Cases > Other Hardware Mods | |
FAQ: Power Pinouts and Wiring
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06-22-07
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 #1 (permalink)
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Turing Test is Overrated
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FAQ: Power Pinouts and Wiring
Here is a reference for the pinouts for the various power plugs in a PC. There are numerous sources so I found the ones with the best pics and diagrams. I AM NOT RESPONSIBLE FOR ANY DAMAGES DONE USING THE FOLLOW INFORMATION.
General Wiring These are the standard wire colors but not all manufacturers follow it. The pinouts diagrams are more reliable. Black = Ground Orange = +3.3v Red = +5v Yellow = +12v White = -5v Blue = -12v Wiring VDrop Calculator Longer and thinner wires increases Vdrop. Calculator is at the bottom of the page. Most PSUs use 18ga wires and occasionally 20ga. If you notice, these wires are rated to handle more current than what we normally provide. The reason is that as you increase the current through the wire, the more voltage-drop will be experienced. http://www.powerstream.com/Wire_Size.htm Motherboard 24-pin ATX, main plug on motherboards (short pin 16 to any GND to turn the PSU on) http://pinouts.ru/Power/atx_v2_pinout.shtml 20-pin ATX, main plug on older motherboards (short pin 14 to any GND to turn the PSU on) http://pinouts.ru/Power/atxpower_pinout.shtml 4-pin AUX, used on motherboards to power CPU http://pinouts.ru/Power/atx12v_pinout.shtml 8-pin EPS, desktop motherboards can use just 4-pin AUX http://www.playtool.com/pages/psucon...tors.html#eps8 Peripheral 4-pin floppy http://pinouts.ru/Power/SmallPower_pinout.shtml 4-pin "Molex" peripheral http://www.technick.net/public/code/...mth_power_5_25 SATA (pins 1,2,3 are not needed for desktop PCs. The 3.3v are used for delayed startup in servers) http://pinouts.ru/Power/sata-power_pinout.shtml 3-pin Fan, sensor is optional. http://www.interfacebus.com/ATX_Moth...or_Pinout.html 4-pin PWM fan, sensor and control are optional http://pavouk.org/hw/fan/en_fan4wire.html Motherboard Slots PCI can each provide 25w at 3.3v, 25w at 5v, and 6w at 12v. However, total power is shared among all PCI slots. A motherboard maybe able only to provide a combined 100-150w to all the PCI slots. PCI-X provides up to 25w, [more to come] AGP provides up to 25w at 12v, [more to come] PCI Express provides up to 75w at 12v PCI Express 2.0 provides up to 150w (200w+ is possible) at 12v USB, do not exceed 2.5w at 5v http://pinouts.ws/usb-pinout.html Firewire [IEEE1394], do not exceed 15w varying 12-25v http://pinouts.ru/Slots/ieee1394_pinout.shtml Video Card 6-pin PCIe, delivers 75w: three +12v, three GND 8-pin PCIe, delivers 150w: four +12v, four GND (electrically compatible with EPS plugs but plug keying may prevent insertion)
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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3GB or so (3) PCIe 2.0 is backwards compatible with PCIe 1.x (4) Resolution, not screen size (5) If you have a question, it is not news (6) Read TOS (7) Report, not respond to Spam (8) Uninstall nTune (9) Single/Non-Modular Rail PSUs are NOT better than Multi-Rail/Modular (10) Edward is the Law! Quote:
Last edited by DuckieHo : 06-27-08 at 04:39 PM. |
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06-22-07
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<3 WAJN <3
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I needed the USB pinout for my iPod, so I could charge it directly off my PSU
 Nice guide
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Ranking based on importance... THE Mouse(-PAD) FAQ Upd: 10/03/08 | 32-bit res fix | S939 DFI's | My AMD de-lid | MMO Toonz | Youtueb Vids | Best thread ever Quote:
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06-22-07
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WaterCooler
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Nice. Now what about converting my 6-pin PCIe to 8-pin PCIe with a converter?
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06-22-07
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#4 (permalink) | |||||||||||||||
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Turing Test is Overrated
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Quote:
GND = GND In theory, the 8-pin PCIe plug can be replaced with just one +12v and one GND plug. However, the only reason that they split the plug up is to reduce wire resistence. You get much greater Vdrop and heat if you push 100w on a single long 18ga wire than 4 long 18ga wires. If your apdapter length is short and you are using thick wires, there should be no issues.
__________________
To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3GB or so (3) PCIe 2.0 is backwards compatible with PCIe 1.x (4) Resolution, not screen size (5) If you have a question, it is not news (6) Read TOS (7) Report, not respond to Spam (8) Uninstall nTune (9) Single/Non-Modular Rail PSUs are NOT better than Multi-Rail/Modular (10) Edward is the Law! Quote:
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06-29-07
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Case Modder
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thanks for this guide. I've never been in the technical side of computers, and haven't the slightest what I'm doing, but want to splice some old female molex connectors on some fans, since they only have odd connections, not the usual fan connections for motherboards.
Looking at the diagram for Molex connectors, the peripheral one is female, correct? meaning, if I have a fan with only 2 wires (Red & black), I connect the red to the yellow, (pin 1) and the black to (pin 2) Black. Yes? I know I can just try it, but why blow my stuff up, when someone probably already had the answer. thanks again.
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I forgot more than I know
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06-29-07
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#6 (permalink) | |||||||||||||||
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Turing Test is Overrated
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Quote:
__________________
To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3GB or so (3) PCIe 2.0 is backwards compatible with PCIe 1.x (4) Resolution, not screen size (5) If you have a question, it is not news (6) Read TOS (7) Report, not respond to Spam (8) Uninstall nTune (9) Single/Non-Modular Rail PSUs are NOT better than Multi-Rail/Modular (10) Edward is the Law! Quote:
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07-26-07
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Foxie
  
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I'm curious why the 8-pin pci-e gained only one 12+v line, but doubled in it's power delivery.
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07-26-07
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#8 (permalink) | |||||||||||||||
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Turing Test is Overrated
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Quote:
Vdrop of 75w with three 18ga copper wires over 2ft = 0.055v (a .46% drop on 12v) Vdrop of 150w with four 18ga copper wires over 2ft = 0.082v (a .68% drop on 12v)
__________________
To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3GB or so (3) PCIe 2.0 is backwards compatible with PCIe 1.x (4) Resolution, not screen size (5) If you have a question, it is not news (6) Read TOS (7) Report, not respond to Spam (8) Uninstall nTune (9) Single/Non-Modular Rail PSUs are NOT better than Multi-Rail/Modular (10) Edward is the Law! Quote:
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08-06-07
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PC Gamer
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Quote:
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08-08-07
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Now Available in Orange
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Wow, firewire has some really bizzare specs. 45w and 30v? You could kill yourself with that, it has happened before on only 30v.
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LinkBacks (?)
LinkBack to this Thread: http://www.overclock.net/other-hardware-mods/203950-faq-power-pinouts-wiring.html
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