New CPU power requirements need new PSU?

[Edgar R. Zakarian]

I was looking at Asus Prime X670-P.
I can see that the new trend is two plugs for CPU power, 8-pin + 4-pin.

Spoiler

My motherboard only has the 8-pin today.

Current motherboard:

Spoiler

I think my power supply only has the 8-pin also.
Do we really need to upgrade our power supplies because of this now?
Using Cooler Master V750 (750W)

[DudeWhatTheN]

2 minutes ago, Edgar R. Zakarian said:

I was looking at Asus Prime X670-P.
I can see that the new trend is two plugs for CPU power, 8-pin + 4-pin.

  Hide contents

My motherboard only has the 8-pin today.

Current motherboard:

  Hide contents

I think my power supply only has the 8-pin also.
Do we really need to upgrade our power supplies because of this now?
Using Cooler Master V750 (750W)

I've got an X670E-PLUS from Asus TUF, plugged in just one of the two 8 PIN cpu cables and it works great.

What that extra 4 pin cable does is providing extra power for the cpu in case of overclocking, but as long as you don't plan on doing that then it's fine plugging just one.

[Edgar R. Zakarian]

2 minutes ago, DudeWhatTheN said:

I've got an X670E-PLUS from Asus TUF, plugged in just one of the two 8 PIN cpu cables and it works great.

What that extra 4 pin cable does is providing extra power for the cpu in case of overclocking, but as long as you don't plan on doing that then it's fine plugging just one.

Ah okay, so basically you think if I plug in the 8-pin and leave the 4-pin out I should be fine (No manual overclocking)?

[DudeWhatTheN]

Just now, Edgar R. Zakarian said:

Ah okay, so basically you think if I plug in the 8-pin and leave the 4-pin out I should be fine?

Yes, you should be fine, as long as you don't have extremely power hungry components, but even then i doubt it would make a difference.

As I said, my mobo has 2x 8 pin CPU headers and with just one plugged it works fine and is stable.

[tkitch]

6 minutes ago, Edgar R. Zakarian said:

I was looking at Asus Prime X670-P.
I can see that the new trend is two plugs for CPU power, 8-pin + 4-pin.

  Hide contents

My motherboard only has the 8-pin today.

Current motherboard:

  Hide contents

I think my power supply only has the 8-pin also.
Do we really need to upgrade our power supplies because of this now?
Using Cooler Master V750 (750W)

your PSU lists:  CPU 4+4 x2

That's 2x4 pin, AKA 8 pin.

 

that's what you use there. 

[cmndr]

non-problem in all likelihood. 

It's probably more of a "feature" for EXTREMEEMEME OVERCLOCKERS!!!1! A single EPS connector can do 300W which is more than the socket is rated for and more than a modestly overclocked 7950x would draw. I wouldn't be surprised (have not verified) if a single EPS connector + the 24 pin connector can push 300-500W. Which is absurd. If you ever upgrade to a (hypothetical, unrelease and unannounced) 32 or 64 core AM5 CPU you might want a new PSU. 

Overclocking hasn't really mattered for most people for years now (10 years ago it was +20-50% performance for free, now it's +2-5% performance and it doubles your energy costs) since both AMD and Intel push parts much closer to their limit and differentiate on core count and/or cache instead of clock speed. 

Here's a related discussion: https://www.reddit.com/r/AMDHelp/comments/zwq1v8/power_supply_for_am5_motherboard/

It looks like in some instances the manuals say "8+4 OR 8 only is fine"

Another discussion: https://www.techpowerup.com/forums/threads/ryzen-zen4-are-both-cpu-power-plugs-required-now.299330/

[Edgar R. Zakarian]

8 minutes ago, DudeWhatTheN said:

Yes, you should be fine, as long as you don't have extremely power hungry components, but even then i doubt it would make a difference.

As I said, my mobo has 2x 8 pin CPU headers and with just one plugged it works fine and is stable.

What CPU are you running with that 8-pin? 
I was considering a 7800X3D or 7700X

[cmndr]

2 minutes ago, Edgar R. Zakarian said:

What CPU are you running with that 8-pin? 
I was considering a 7800X3D or 7700X

The 7800X3D has a max PPT of 162W. The EPS connector delivers 300W and the other 24 pin PSU connector provides power as well. 

You've got probably 2-5x the power needed for that. 

As an FYI, Zen 5 will come out eventually. Don't go too crazy future proofing unless there's a tangible use case in the short to mid-term. You can always upgrade later. 

[Somerandomtechyboi]

52 minutes ago, cmndr said:

It's probably more of a "feature" for EXTREMEEMEME OVERCLOCKERS!!!1! A single EPS connector can do 300W which is more than the socket is rated for and more than a modestly overclocked 7950x would draw. I wouldn't be surprised (have not verified) if a single EPS connector + the 24 pin connector can push 300-500W. Which is absurd. If you ever upgrade to a (hypothetical, unrelease and unannounced) 32 or 64 core AM5 CPU you might want a new PSU. 

I wouldnt be surprised if the eps connector can handle well over 500w, i mean theres ppl extreme overclocking x58 on boards that only have one 8 pin

 

if that connector really isnt capable of >500w then this would problably be impossible cause melting eps cable

 

Cable ratings are extremely conservative to accomodate the shittiest psus with thin wires so makes sense that thick cable psus can well exceed ratings no problem

[DudeWhatTheN]

7 hours ago, Edgar R. Zakarian said:

What CPU are you running with that 8-pin? 
I was considering a 7800X3D or 7700X

yup, I'm using the 7800x3d