Nonetheless, information leaks out from the specification and the 6 pin PCI Express power cable is actually rated at an extremely conservative 75 watts. Pinout Pin number Wire color Description 1 black ground 2 black ground 3 black ground 4 orange +3.3 volts 5 orange +3.3 volts 6 red +5 volts Connector part numbers Motherboard May 21, 2011, 05:59:02 PM #9 Quote from: Basiley on May 21, 2011, 05:41:53 PMif he' just lack of extra 6-pin PCI-e out from powerful enough PSU[which is unlikely, cuz all The 8 pin 12 volt cable is polarized so it can only be plugged into the 8 pin motherboard connector correctly. http://simplecoverage.org/graphics-card/what-pcie-slot-should-i-connect-my-video-card.php
I've also seen claims that there may be unimplemented sense lines in the specification. When you plug a 20 pin cable into a 24 pin connector you're not providing the extra current carrying capacity which may be needed by the motherboard. If the connectors aren't labeled then you can tell an 8 pin PCI Express power cable from an EPS 8 pin 12 volt cable by checking the color of the wires I'm not sure if that's still within safe limits (the wires probably won't overheat, but the connector could get damaged at the point where you're splitting it).If you still want to
May 21, 2011, 05:37:20 PM #7 Quote from: gigabytecoin on May 21, 2011, 12:06:58 PMSo WHY do I have to purchase a 6 pin to 6+2 pin dual pcie power cable You should only plug the 8 pin 12 volt cable into the motherboard connector where it belongs unless you enjoy the smell of fried electronics. Most of the specifications which spell out the maximum wattage provide a wide safety margin by defining a value which is far below the maximums supported by the connector and wire.
If you plug the two pieces of a 20+4 power cable together then you have a 24 pin power cable which can be plugged into a 24 pin motherboard. 4 pin Any number of physical changes can also cause higher connector resistance which causes more problems. If you use an adapter then be sure to plug the 4 pin peripheral connectors into separate cables coming from the power supply. How To Connect Graphics Card To Power Supply If the table provides an "Unofficial cable/connector maximum wattage" then that specification doesn't provide the maximum and the value in the table is a practical maximum wattage defined by the maximums
You're supposed to use the left half of the cable shown above when plugging it into a 4 pin motherboard connector but the right half will also fit. Pci-e Cables People use 6->8 pin adapters all the time and as you already said, the 6+2 pin connectors only add 2 more ground wires. It's also helpful if you use a connector as close to the PSU as possible rather than sticking things at the end of the cable. http://www.tomshardware.com/answers/id-1972505/powering-gpu-pci-2pin-connectors.html If the motherboard expects two 12 volt rails (many dual CPU motherboards require one 12 volt rail per CPU) then it won't work.
As time passed, computers drew more and more of their load from 12 volts (see here). Graphics Card Cable Monitor Pages:  « previous topic next topic » Print Author Topic: Why do they even require two pcie power slots in a video card??? (Read 26041 times) gigabytecoin Sr. They're just extra lines to provide more current to the same rails. The wires will simply overheat.
But as with connectors of this type, you can sometimes force them into the wrong kind of socket if you try hard enough. http://www.tomshardware.com/answers/id-2213416/simple-graphics-card-cable-question-6pin-6pin-cables-6pin-2x6pin-splitter.html Pinout Pin number Wire color Description 1 orange power good 2 red +5 volts or connector key 3 yellow +12 volts 4 blue -12 volts 5 black ground 6 black ground Graphics Card Has 2 6 Pin Connectors It provides a maximum of 63.5 watts. Graphics Card Power Cable 6 Pin This kind of cable is also sometimes used as an auxiliary power cable for AGP video cards which use more power than can be drawn from the motherboard slot.
In fact, they usually make things worse. People use 6->8 pin adapters all the time and as you already said, the 6+2 pin connectors only add 2 more ground wires. An error (403 Forbidden) has occurred in response to this request. The two negative rails are "bias" supplies which only have to provide small amounts of current. Graphics Card Power Cable 8 Pin
People often use the term "4 pin Molex power cable" or "4 pin Molex" to refer to a four pin peripheral power cable. Pinout Pins 1 through 3 Pins 4 through 6 Description Wire color Pin number Pin number Wire color Description +12 volts yellow 1 5 black ground +12 volts yellow 2 6 The extra 4 pins were added to the 24 pin version of the cable to provide one extra wire for ground, 3.3, 5, and 12 volts. Pinout Pin number Wire color Description 1 red +5 volts 2 black ground 3 black ground 4 yellow +12 volts Connector part numbers Socket housing Socket Maximum current per circuit AMP
May 21, 2011, 05:21:03 PM #5 There is a limit to the amount of power you can draw on a given rail/connector. Graphics Card Cable To Motherboard Connectors really do get hot if you overload them so the safest thing to do is use a real 24 pin power supply on a motherboard with a 24 pin connector. The connector is shaped so that it only fits in one way.
People with older power supplies often use adapters which convert from 4 pin peripheral cables to SATA power cables. Member Offline Activity: 42 Re: Why do they even require two pcie power slots in a video card??? These are sometimes called "PCI Express cables". Graphics Card Cable Types On the 8 pin PCI Express cable, the wires on the clip side are all black (grounds).
Sadly, some large computer vendors like to lock customers into buying upgrades from them rather from a third party. An error (403 Forbidden) has occurred in response to this request. About the only good thing it does is to make sure the 20 pin connector on the adapter melts rather than the 24 pin connector on the motherboard. connectors used by both kinds of power cables can sometimes be forced into a differently-polarized connector if they only have a few pins and you push hard enough.
It's still around and is now also used for all kinds of things including add-on fans, extra video card power, supplemental motherboard power, and case lighting. Spreading the current between the cables reduces the voltage drops and power loss. Advertised sites are not endorsed by the Bitcoin Forum. But since 4 pin peripheral connectors only supply 5 and 12 volts, the SATA connector is missing 3.3 volts (there's no orange wire).
But as with this kind of connector, you can sometimes force the wrong kind of cable into a connector if you push hard enough. As a result the PSU delivers most of its wattage at 5 volts. Never plug one of those into a disk drive. tom_o Sr.
The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction. Even with only two 12 volt lines the standard implementation of PCI Express power cables use large enough gauge wire and a good enough connector to provide much more than the Member Offline Activity: 40 Re: Why do they even require two pcie power slots in a video card???