Cooler Master Case Cosmos SE Full tower 2-pin molex connector

[Joel_123]

Sorry for my english.

Hi guys
I bought a cosmos SE case and this case has this 2-pin molex (male )connector: https://www.pimfg.com/products-large/POWER-3P4P-6-1.jpg. I think, is probably a led.

Can I plug the 2-pin molex connector to a 4 pin female connector of my PSU?
https://files.cablewholesale.com/hires/11w3-04412_02.jpg

I have this PSU: https://seasonic.com/product/x-850/ (I'm asking for the peripheral female 4-pin) http://seasonic.com/main/wp-content/uploads/2015/04/PERIPHERAL-4-PIN-A.png

This is the case: http://www.coolermaster.com/case/full-tower-cosmos-series/cosmos-se/

Thanks in advance =)

 

[Aeacus]

You're completely fine plugging the 2 wire molex male to a 4 wire molex female connector. No harm there.

The reason why the molex male connector have only 2 wires is because it carries only the 12V rail and ground in it to power the component. Regular molex has 12V rail, 5V rail and two ground wires.

 

[Joel_123]

Thank you so much, it works.

When I was a Kid I built my first PC. I connected a 4-pin molex (male) into a 2-pin molex (female) and that burned the PSU, so that's the reason why I was asking.

Thank you again

 

[Aeacus]

You're welcome.

The reason why your old PSU did burn was probably because you plugged 12V rail into PSU's 5V rail and once you booted up, the component wanted to draw far more power than 5V rail can handle. It probably overloaded your PSU's 5V rail which in turn caused your PSU to fail completely.

Low build quality PSUs usually do fail completely when over-current happens while in good build quality PSUs, the over-current safeguard kicks in and shuts the entire PC safely down without any harm to the PC and PSU.

 

[Joel_123]

I see, thanks for the information.

Another question. Can I plug in a 3-pin molex (male) into a 4-pin molex (female) too?

 

[Aeacus]

I see, thanks for the information.

Another question. Can I plug in a 3-pin molex (male) into a 4-pin molex (female) too?

Basically, you can. But i'm wondering why the molex has 3 pins. Does it have 12V, 5V and 1 ground wire? If so then that gets sketchy since for safest operation, it's good when each rail has it's own ground wire.

By default, 12V rail is red wire, ground is black wire and 5V rail is yellow wire.

 

[Joel_123]

I was asking because when I was looking for a solution to my first question, I read about someone asking how to connect this (http://www.coinware.eu/tuotekuvat/900x600/4pin_to_3pin.jpg) to his PSU.

 

[Aeacus]

As seen from the image, that adapter uses only 12V rail and two ground wires. Connecting that adapter is safe.

Oh, i made a mistake earlier by mixing up the colors of 12V and 5V rails. 12V rail is actually yellow wire while 5V rail is red wire.

For further reading about PSU connectors, a great site to look at: http://www.playtool.com/pages/psuconnectors/connectors.html