PSU hook up question

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Muckster

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Dec 13, 2013
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Here's my build which I'm currently putting together. It's been a while since I hooked on of these up, so excuse the noob question:

build:
https://pcpartpicker.com/user/pshopper/saved/#view=mWCRsY

So the PSU has a 24 pin modular cable which must go to the 20 pin interface on the mobo. This leaves me with only a 20 pin hookup which the mobo manual implied it could do. There is no place for the other 4 pin interface which dangles off the end of the cable.

Without a monitor attached, I powered up and the cpu fan didn't spin, but the lights for the front panel switches lit up. The PSU fan didn't spin, but that's expected because it doesn't fire up until needed. Seeing the CPU fan didn't spin, I turned the power off and unplugged immediately. Is there a chance I just damaged something?

I'm guessing that to get the full 24 pin power, I believe I need to use a second 6 pin modular cable, plugging into one of the HDD interfaces on the PSU. Then, I run that to another 4 pin interface on the mobo which is far away from the 20 pin interface already in use. This 4 pin interface is indicated in the mobo manual as what I should use for 24 pin power. Is this correct? Is this what I need to do to get things working?

Thanks for the help.
 
Solution
S
No, modern processors have been designed now for years to survive a heatsink falling off. Especially if you have the heatsink attached properly you can run them for a while with no fan. It is possible if the fan is not connected properly that the motherboard will not boot. But if you did not connect the CPU power connector, that is your problem. No CPU power, no BIOS, and thus no fan control for the CPU fan. I looked at your build and there is a 4 pin CPU power connector. That is your problem. I can not see it in the image for some reason, but it should be between the CPU socket and the back panel connectors.

Don't do anything with the extra four pins on the motherboard power connector. And don't try using the six pin...
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shiitaki

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No, modern processors have been designed now for years to survive a heatsink falling off. Especially if you have the heatsink attached properly you can run them for a while with no fan. It is possible if the fan is not connected properly that the motherboard will not boot. But if you did not connect the CPU power connector, that is your problem. No CPU power, no BIOS, and thus no fan control for the CPU fan. I looked at your build and there is a 4 pin CPU power connector. That is your problem. I can not see it in the image for some reason, but it should be between the CPU socket and the back panel connectors.

Don't do anything with the extra four pins on the motherboard power connector. And don't try using the six pin connector for CPU power. The 6 pin connector is for graphics cards. There are also 8 pin graphics card connectors, should be one solid piece. The CPU power connector from the supply will be either 4 or 8. And if it is 8 pins in 2 pieces, just use one of them. Be careful, it is keyed to go only one way, so beware to not use a lot of force and defeat the keying.
 
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Muckster

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Dec 13, 2013
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Thanks. That was it. I also had some confusion regarding the power swing plug orientation on the System Panel Header. I was plugging in horizontally instead of vertically and apparently using the wrong ground pin. Mobo manual wasn't clear and it never described the CPU port as CPU power.

Anyway, it's looking good so far. Thanks. Good call.

 
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