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Potential Limitations of PCI-E 6-Pin to 8-Pin adapters - Page 3

post #21 of 48
Quote:
Originally Posted by xtremetechuk;12754167 
Example -
On multi-rail powersupplys there maybe two PCI-E 6-Pin connections on a single 12V rail, which may only be rated for 15A (180W). While this is perfectly fine for two PCI-E 6-Pin connections (75W+75W). You may not be able use PCI-E 6-Pin to 8-Pin adapters, as this would exceed the maximum wattage on the 12V 15A rail (150W+150W).

But whether using 6-pin PCI-E connectors, or 6+2-pin PCI-E connectors, there are still only three +12v conductors and three ground conductors connected to the PSU, correct?
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post #22 of 48
Thread Starter 
Quote:
Originally Posted by Arctucas;12754236 
But whether using 6-pin PCI-E connectors, or 6+2-pin PCI-E connectors, there are still only three +12v conductors and three ground conductors connected to the PSU, correct?

Yes, except PCI-E 8-Pin connections have two extra ground connections

PSU manufactures may only abide to official specifications, and wouldn't need more than 15A for two PCI-E 6-Pin connections.
post #23 of 48
Yes, but the two extra ground connections are simply connected to two of the existing conductors.

They cannot provide extra amperage.
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post #24 of 48
6+2 pin = 8pin
ergo 6+2 can provide 150w because its an 8pin
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post #25 of 48
Quote:
Originally Posted by thealex132;12754647 
6+2 pin = 8pin
ergo 6+2 can provide 150w because its an 8pin

Except currently the 2 extra pins are used as grounds.
post #26 of 48
Thread Starter 
Quote:
Originally Posted by Arctucas;12754555 
Yes, but the two extra ground connections are simply connected to two of the existing conductors.

They cannot provide extra amperage.

Correct.

In theory both connections can supply 250W each, however both will be limited to the 12V rail. And as said above, PSU manufactures may only abide to official specifications which is 6-Pin=75w and 8-Pin=150w. So they wouldn't need more than 15A for two PCI-E 6-Pin connections. However the official wattage for two PCI-E 8-Pin connections is 300W, which exceeds 15A (180W).

Hope this helps wink.gif
post #27 of 48
Quote:
Originally Posted by Eagle1337;12754659 
Except currently the 2 extra pins are used as grounds.

Yes but manufact. like Corsair will obviously make sure at least 150w can pump through it.
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post #28 of 48
Quote:
Originally Posted by thealex132;12754647 
6+2 pin = 8pin
ergo 6+2 can provide 150w because its an 8pin

It is electrically three +12v conductors and three ground conductors.

The two extra conductors connected to two of the existing ground conductors do not provide any extra ampacity.
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post #29 of 48
Quote:
Originally Posted by xtremetechuk;12754688 
Correct.

In theory both connections can supply 250W each, however both will be limited to the 12V rail. And as said above, PSU manufactures may only abide to official specifications which is 6-Pin=75w and 8-Pin=150w. So they wouldn't need more than 15A for two PCI-E 6-Pin connections. However the official wattage for two PCI-E 8-Pin connections is 300W, which exceeds 15A (180W).

Hope this helps wink.gif

I am quite aware of how DC circuits function.

The 6-pin PCI-E is capable of providing exactly the same amount of current as the 6+2-pin PCI-E.
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post #30 of 48
Quote:
Originally Posted by Arctucas;12754773 
It is electrically three +12v conductors and three ground conductors.

The two extra conductors connected to two of the existing ground conductors do not provide any extra ampacity.

So then if Corsairs (for EG) 6+2pin can provide 150w then their 6 pins can provide 150w therefore a 6 pin to 8 pin would be 100% fine. I thought you said it wasn't fine? This thread is more saying 'don't buy a bad PSU'
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