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Thread: Why you shouldn't use a well made 4 pin molex to (6+2)8pin pcie adaptors

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    Quote Originally Posted by Mezoxin View Post
    that is sad , i don't know why gpu manufacturers allow for such user error when clearly the molex cables/connectors are not capable of safely handling the power draw of the pcie 8 pin
    Probably that they don't know better, it's most likely done by people from marketing. Or they don't care, because it won't hurt the graphics card.

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    Quote Originally Posted by Spotty View Post
    Purely driven by aesthetics i see , at least that is a lot safer than molex
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    Quote Originally Posted by Mezoxin View Post
    doesn't really matter if it was one or two or even 4 as long as he uses them from the same cable , all of these are sourced from a single 12v pin in the back of the psu
    2 molex to pcie 6 pin.
    2 12V wires to 2 12V wires, that what 6 pin need.
    https://www.ebay.com/itm/8-Inch-20cm...e/182276467996
    2 molex to pcie 8 pin.
    2 12V wires to 3 12V wires, Not preferable.
    https://www.ebay.com.au/itm/4-pin-Mo...-/321457836427
    Not that I recommend those connectors.

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    Quote Originally Posted by none77 View Post
    2 molex to pcie 6 pin.
    2 12V wires to 2 12V wires, that what 6 pin need.
    https://www.ebay.com/itm/8-Inch-20cm...e/182276467996
    2 molex to pcie 8 pin.
    2 12V wires to 3 12V wires, Not preferable.
    https://www.ebay.com.au/itm/4-pin-Mo...-/321457836427
    Not that I recommend those connectors.
    if you look at the 6pin aux pinout you will see the problem , it has a single 12v pin (yellow box)
    those two 12v wires on the molex are sourced (daisy chained) from a single 12v pin on the back of the psu , which is rated at a maximum of 8A , that is the bottleneck here and not the wires , and that why it failed
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    youtube algorithm just decided to show me this to piss me off

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    https://linustechtips.com/main/topic...-melted-satas/

    This HX1200 had 3 molten peripheral connectors , why would anyone use adaptors on this unit
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    One might have hoped that Over Current Protection (OCP) had kicked in rather than 3 connectors fail on one unit.
    Attached Images Attached Images
    Last edited by ashiekh; 01-16-2020 at 01:26 PM.

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    it wont kick in because that pin is rated for 8A
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    That is my point, the OCP is not properly engineered.

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    you are correct the way that OCP is configured in general wont protect against all scenarios

    but that specific failure was caused intentionally by using aftermarket adaptors and bypassed the safe design that made that pin draw more than 8 A and less than 40A in a sustained manner

    but if it was some other sort of failure such as pinched wires or broken connectors , that formed a resistive load on the same peripheral cables then its more likely that the amps would spike to 40A and trigger the OCP before damaging the back connectors
    CPU: i7 9700K / Motherboard: Gigabyte z390 Aorus Pro Wifi
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