DuckieHo

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: three +12v, five GND (not electrically compatible with the CPU's EPS plugs!)

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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular

gonX

I needed the USB pinout for my iPod, so I could charge it directly off my PSU
Nice guide

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killnine

Nice. Now what about converting my 6-pin PCIe to 8-pin PCIe with a converter?

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DuckieHo

+12v = +12v
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.

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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular

lobi

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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DuckieHo

Good idea... I'll add which plug is providing power later.

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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular

Mootsfox

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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DuckieHo

Probably that the vDrop is consider acceptable...

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)

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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular

Muhahahaha

Can't you just plug it in to your computer via USB or Firewire?

Fishie36

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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