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Is the 4 pin ATX12V2 Connector Necessary

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scjconsulting View Drop Down
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    Posted: 15 Mar 2020 at 5:14am

On a X570 Steel Legend Motherboard, is a power cable to the 4 pin 12V Power Connector (ATX12V2) necessary? I am using a Corsair RM750x, several years old, and they do not provide such a cable. I don't remember my X399 Taichi having such a requirement.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RLGL Quote  Post ReplyReply Direct Link To This Post Posted: 16 Mar 2020 at 9:49pm
YES Time to update power supply.
Asrock Z370 Gaming K6,Intel i7 8700K,
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Post Options Post Options   Thanks (1) Thanks(1)   Quote gizmic Quote  Post ReplyReply Direct Link To This Post Posted: 16 Mar 2020 at 11:11pm
most boards nowadays have 8 and a 4 pin you dont need to plug both
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scjconsulting Quote  Post ReplyReply Direct Link To This Post Posted: 17 Mar 2020 at 12:59am

It does appear that the 4 pin connector is not needed. I don't know of any power supply that has that supports that cable.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ThreeDee Quote  Post ReplyReply Direct Link To This Post Posted: 17 Mar 2020 at 1:55am
most higher end psu's come with 2 x 4+4 power pins for 4 and 8 pin mobo headers .. if you start running into stability issues .. especially under full load .. then it would behoove you to get a better psu
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 17 Mar 2020 at 4:36am
It really depends on the CPU you use, something like a 3900x or 3950x would benefit
from the extra power/stability and lower heat that comes with using both the 8 and
4 pin connectors. Not using it means more current being pulled through the 8 pin
which in turn creates more heat on that power circuit. Regardless of needed or not
there is an actual benefit to connecting it, better efficiency and possibly less
heat around the connector and related components.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kasazza Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jul 2022 at 12:16am
I am building a PC with AsRock Intel H570 Steel Legend + i7-11700 + standard DDR4-3200 RAM modules

No planning to overclock RAM or CPU o GPU

GPU planned initially a old Geforce 1060 from the today PC

The PSU designed for this build is Corsair RM750x which is without outlet for the second ATX12V, but if necessary I may think to return it and buy a new one.
Anyway for the planning needs, for the level of GPU I am about to buy in the future, it's very powerful, it may be enough 550-600W...

Your recommendations to connect both ATX12V 8+4 plugs is valid also for INTEL CPUs?

On the PDF guide of the MoBo it only speaks

"... Connecting an ATX 12V 4-pin cable to ATX12V2 is optional.
*For advanced overclocking we suggest using this connector together with ATX12V1..."

It does not say anything else or more detailed: thank you for every reply!
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