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4pin vs. 8pin cpu power

post #1 of 6
Thread Starter 
looking to build htpc, mATX form factor with 1155 chipset, came across multiple boards with either a 4 pin cpu power or an 8pin cpu power connector... is there any decernable difference between the different power connections?
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post #2 of 6
I think 8pin gives you cleaner power(unsure but i think thats it)
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post #3 of 6
I believe 8 pin gives more power, which is useful for overclocking.
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post #4 of 6
8-pin I believe reduces voltage fluctuations and such. It doesn't actually give your CPU more juice.
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post #5 of 6
nah i guess 8 pin mobos are more oc oriented ...

this explains it all
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post #6 of 6
http://www.playtool.com/pages/psuconnectors/connectors.html#eps8
Quote:
This cable was originally created for workstations to provide 12 volts to power multiple CPUs. But as time has passed many CPUs require more 12 volt power and the 8 pin 12 volt cable is often used instead of a 4 pin 12 volt cable. Depending on the power supply, the connector may contain one 12 volt rail in all 8 pins or two 12 volt rails taking up 4 pins apiece. It is often refered to as an "EPS12V" cable.

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4
Quote:
Older computers put most of their load on 3.3 and 5 volts. As time passed, computers drew more and more of their load from 12 volts (see here). Before this power cable was introduced there was just one 12 volt line provided to the motherboard. This cable added two more 12 volt lines so more of the load could be shifted to 12 volts. The power coming from this connector is usually used to power the CPU but some motherboards use it for other things as well. The presense of this connector on a motherboard means it's an ATX12V motherboard. For dual 12 volt rail power supplies, this connector provides the voltage refered to as 12V2. The power cable which plugs into the 4 pin connector has two black wires and two yellow wires. This cable is sometimes called an "ATX12V" cable or "P4" cable although neither of those are technically accurate descriptions.

If you have one of these connectors on a motherboard then you must plug a power cable into it or your CPU won't get any power. The one exception is that when this connector was new, some motherboards shipped with a socket into which you could plug a 4 pin peripheral power cable as an alternative. That helped people who had older power supplies which didn't have the 4 pin 12 volt cable.
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