Is the 4 pin ATX12V2 Connector Necessary

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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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scjconsulting Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Apr 2017 Location: Minnesota Status: Offline Points: 57	Post Options Post Reply Quote scjconsulting Report Post Thanks(0) Quote Reply Topic: Is the 4 pin ATX12V2 Connector Necessary 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.
	scjconsulting

RLGL Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 29 Jul 2018 Location: MN Status: Offline Points: 2025	Post Options Post Reply Quote RLGL Report Post Thanks(0) Quote Reply Posted: 16 Mar 2020 at 9:49pm
	YES Time to update power supply.
	Asrock Z370 Gaming K6,Intel i7 8700K, Asrock x570 Taichi

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(1) Quote Reply Posted: 16 Mar 2020 at 11:11pm
	most boards nowadays have 8 and a 4 pin you dont need to plug both


scjconsulting Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Apr 2017 Location: Minnesota Status: Offline Points: 57	Post Options Post Reply Quote scjconsulting Report Post Thanks(0) Quote Reply 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.
	scjconsulting

ThreeDee Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 24 Jul 2019 Location: Billings,MT Status: Offline Points: 2396	Post Options Post Reply Quote ThreeDee Report Post Thanks(0) Quote Reply 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
	\|Ryzen 5 5900\|ASRock X570 Taichi-BIOS 4.60\|2x16GB HyperX Predator RGB 3200@3600 1:1 IF\|ASRock RX 6700XT\|2 x PCIe 4.0 M.2 Drives for OS & Games\|850 WTT Seasonic 80+ Titanium PSU\|Noctua NH-D15\|

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25208	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply 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.


Kasazza Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Jul 2022 Location: Italy Status: Offline Points: 45	Post Options Post Reply Quote Kasazza Report Post Thanks(0) Quote Reply 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!