Is the 2nd cpu power connector needed for a msi pro b650 A

[Benson]

I have a b650 A with a ryzen 7 7700x and 4070.i have 2 cpu power sockets but my power supply only (650w) has one.is it needed or will i need to get a new power supply.i dont plan to overclock it at all

[_I_]

yes, the board needs enough power to the cpu

get a better psu with 2x 4+4 eps connectors and the 12v hpwr 12+4 connectors

[Benson]

Originally posted by Mad Scientist:

Originally posted by Benson:

I have a b650 A with a ryzen 7 7700x and 4070.i have 2 cpu power sockets but my power supply only (650w) has one.is it needed or will i need to get a new power supply.i dont plan to overclock it at all

Always read the manual for such questions, it comes with your product.

Beware splitters might not be able to deliver enough power and could cause stability issues. Only use dedicated cpu power from the psu itself for cpu connections.

But the manual is.... bad. So, id say connect both by default. Else, booting with insufficient power with just the 8pin may give you a post code for CPU or it may be unstable, fail to boot correctly etc.

I looked over the manual but it says nothing.i asked onnreddit and they said that the 2nd connecter is mainly for overclocking but i came here to get a seccond opinion

[_I_]

4+4 would have about a 200w limit

the 7700x max is around 210w @1.xv, and its about 90% efficient converted from 12v
would be about 230w
slightly more than the 4+4 eps can deliver

some boards also use that to help power the pci slots, upto 75w ea

[Set-115689]

Cpu has a tdp of 105w. One should be fine. Even if the power draw goes up to 145w should still be fine.

May as well look at manual to see which socket to plug it into first. Doesn't seem to matter but still might be good to do.

[Bad 💀 Motha]

Originally posted by tbialoof:

336w for one of the 8pins no?

edit: seems they are technically rated for 225w but the cpu/mobo will have that spec in mind and there is headroom

i think the 336w number comes from the overhead required for the connection, to avoid melting the connector if its loose etc (hi nvidia!)

When speaking about the 24pin Main or 4/8 pin EPS connectors though it's been a very rare thing to have happen, to have those Motherboard connections getting too hot and/or melting. Usually what would happen if you have an issue with the pin connectors on an EPS plug is the PSU not able to deliver the power properly and thus the PC shutting off under very high sustained loads. For example a loose EPS connector would most certainly cause this to happen, as opposed to getting too hot and/or melting

8pin GPU connection is rated for 150w max; while a 8pin EPS Motherboard connection is rated for 300w max. As the EPS connection has an additional 12V line within it.

On AM4/AM5 Motherboard probably the only time you need 2x 8pin EPS connections plugged in without a heavy OC is when using Ryzen 9 series (5900X; 7900X; 9900X; etc)

On INTEL platform however it's best to use both 8pin EPS when using a 12th, 13th, 14th Gen i9

That means having a decent PSU of approx 750w minimum so you are provided 2x 4+4 pin EPS connectors