Ryzen Zen4: Are both CPU power plugs required now?

[A Computer Guy]

With Zen2/Zen3 the 2nd plug (usually an additional 4 pin) wasn't necessary.

 

[oxrufiioxo]

With Zen2/Zen3 the 2nd plug (usually an additional 4 pin) wasn't necessary.
View attachment 263303

Doubtful, a single EPS can do 300W I doubt you can pump 300W into even a 7950X and cool it. Doesn't hurt to plug it in though.

 

[Space Lynx]

With Zen2/Zen3 the 2nd plug (usually an additional 4 pin) wasn't necessary.
View attachment 263303

Great question, I was wondering this earlier today as well.

Doubtful a single EPS can do 300W I doubt you can pump 300W into even a 7950X and cool it. Doesn't hurt to plug it in though.

How about a 7600x?

 

[R0H1T]

AMD making PSU's great relevant again? Just like with 295x2 or the FX 9590

AMD Radeon R9 295X2 Specs

AMD Vesuvius x2, 1018 MHz, 2816 Cores, 176 TMUs, 64 ROPs, 4096 MB GDDR5, 1250 MHz, 512 bit

www.techpowerup.com

 

[Space Lynx]

AMD making PSU's great relevant again just like with 295x2

AMD Radeon R9 295X2 Specs

AMD Vesuvius x2, 1018 MHz, 2816 Cores, 176 TMUs, 64 ROPs, 4096 MB GDDR5, 1250 MHz, 512 bit

www.techpowerup.com

No, plenty of x570 boards had two eight pin connectors, but most people only used one of them. Actually Hardware Overclocking over on youtube confirmed this on his x570 Tomahawk video.

OP'squestion is legit and not ironic, not sure why you bringing up something like a gpu which has nothing to do with this.

 

[oxrufiioxo]

Great question, I was wondering this earlier today as well.



How about a 7600x?

Both the 7700X and 7600X use less than half the wattage a single eps can provide come on guys. Does that mean a motherboard maker wouldn't make the dumb decision to require both no but neither cpu will draw anywhere near what a single eps will provide and even if you pushed them there is no way in hell you could cool 300w on either cpu.

 

[Space Lynx]

Both the 7700X and 7600X use less than half the wattage a single eps can provide come on guys.

In the past, pre-x570, and on Intel side, it still required you plugin to both slots for it to work, whether or not what CPU you used.

OP question still has not been answered.

 

[INSTG8R]

I just bought a brand new X570S and is is just 8+4 so I still say the single 8 is more than sufficient for the average user

 

[oxrufiioxo]

In the past, pre-x570, and on Intel side, it still required you plugin to both slots for it to work, whether or not what CPU you used.

OP question still has not been answered.

The answer is no to the cpu needing it. That doesn't mean a motherboard manufacturer won't require it to boot although this would be a pretty dumb decision with any current ryzen 7000 CPU.... IF Ryzen 8000 goes up to 24 or 32 cores and 6ghz+ stock then maybe.

 

[tabascosauz]

With Zen2/Zen3 the 2nd plug (usually an additional 4 pin) wasn't necessary.

So many threads on this topic lmao. A modern solid 8-pin hasn't changed, it's still north of 300W.

But as for the cables themselves........it probably still isn't "necessary" but for the 230W parts you may as well just plug it in. Stock PSU cables from reputable brands on good PSUs should always be fine, but with some dodgy third party sleeved cables cheaping out on wire gauge you may actually run into problems. You have to remember that the EPS provides all the power for CPU power plane, including VRM losses. Modern midrange-high end AM4/AM5 VRMs have excellent efficiency but not necessarily at the power level the CPU runs at (ie. way overspecced, kinda like a PSU efficiency curve).

Obviously, no change on the 142W parts (7600X/7700X). But more and more boards will have it now as it kinda makes sense, whereas on AM4 board vendors were adding extra 8-pins for the fun of it.

I have a set of ridiculously chunky Corsair extensions for my SF750 and was benching 5900X close to 230W with no problems on one 8-pin. But at the same time the board did have 2 x 8-pins, just was too lazy to route a whole other cable. I'm not sure I would have trusted one of my Cablemod sets enough to do the same.

 

[INSTG8R]

In the past, pre-x570, and on Intel side, it still required you plugin to both slots for it to work, whether or not what CPU you used.

OP question still has not been answered.

Uh WUT? I have never plugged in more than an 8 pin in ANY board in the last decade, unless you are doing some kind of extreme LN2 shit single 8 pin has ALWAYS been enough...
Edit: Now way back in the day some boards had an extra Molex connnction for multi GPU that I have used in like 2006

 

[A Computer Guy]

So many threads on this topic lmao. A modern solid 8-pin hasn't changed, it's still north of 300W.

I know right. You'd think I'd learn my lesson by now.

But as for the cables themselves........it probably still isn't "necessary" but for the 230W parts you may as well just plug it in. Stock PSU cables from reputable brands on good PSUs should always be fine, but with some dodgy third party sleeved cables cheaping out on wire gauge you may actually run into problems.

This is why I ask. I get new information all the time and this seems to be an interesting point in favor of using both connectors.

 

[oxrufiioxo]

So many threads on this topic lmao. A modern solid 8-pin hasn't changed, it's still north of 300W.

But as for the cables themselves........it probably still isn't "necessary" but for the 230W parts you may as well just plug it in. Stock PSU cables from reputable brands on good PSUs should always be fine, but with some dodgy third party sleeved cables cheaping out on wire gauge you may actually run into problems.

Obviously, no change on the 142W parts (7600X/7700X). But more and more boards will have it now as it kinda makes sense, whereas on AM4 board vendors were adding extra 8-pins for the fun of it.

I have a set of ridiculously chunky Corsair extensions for my SF750 and was benching 5900X close to 230W with no problems on one 8-pin. But at the same time the board did have 2 x 8-pins, just was too lazy to route a whole other cable. I'm not sure I would have trusted one of my Cablemod sets enough to do the same.

Done the same pushed my 5950X pass 200w on a single 8pin eps even though my board has two just messing around. I have a 1000w titanium rated Seasonic psu though but really nobody should be running shoddy psu or cables on next gen parts from either company.

I know right. You'd think I'd learn my lesson by now.

This is why I ask. I get new information all the time and this seems to be an interesting point in favor of using both connectors.

If you have both connecters no reason not to plug them in unless you have a tiny case and need all the space you can get.

 

[AleXXX666]

No, plenty of x570 boards had two eight pin connectors, but most people only used one of them. Actually Hardware Overclocking over on youtube confirmed this on his x570 Tomahawk video.

OP'squestion is legit and not ironic, not sure why you bringing up something like a gpu which has nothing to do with this.

most people don't understand so, why on earth they need such a "high end" board lol

 

[INSTG8R]

Done the same pushed my 5950X pass 200w on a single 8pin eps even though my board has two just messing around. I have a 1000w titanium rated Seasonic psu though but really nobody should be running shoddy psu or cables on next gen parts from either company.



If you have both connecters no reason not to plug them in unless you have a tiny case and need all the space you can get.

Precisely any decent quality PSU would never require any extra connections

 

[oxrufiioxo]

Precisely any decent quality PSU would never require any extra connections

That new 6ghz intel cpu might require it assuming anyone can cool it. I guess we will find out next year.

 

[Space Lynx]

most people don't understand so, why on earth they need such a "high end" board lol

someone wanting to run a 7600x on the $299 steel legend mobo and a 6800 xt (entire system would pull around 550 watts) my psu is 700w evga gold rated and it is a great psu B-Tier list last I checked. got a great deal on it when it launched and only has 1 8 pin for cpu.

I could upgrade my psu sure, but if there is no need there is no need.

Uh WUT? I have never plugged in more than an 8 pin in ANY board in the last decade, unless you are doing some kind of extreme LN2 shit single 8 pin has ALWAYS been enough...
Edit: Now way back in the day some boards had an extra Molex connnction for multi GPU that I have used in like 2006

I must not have misread then, I remember Actually Hardcore Overclocking on yuotube on the x570 tomahawk making a comment about how nice it was that board only needed one 8 pin plugged in. so i guess i just misread his tone

 

[Zach_01]

I know right. You'd think I'd learn my lesson by now.

This is why I ask. I get new information all the time and this seems to be an interesting point in favor of using both connectors.

A reviewer I saw yesterday was measuring the CPU EPS 12V rails connector for CPU power draw before VRM losses.
He didn't specify though if he plugged both, I'm guessing he did.


Test was Blender and the power value includes the VRM losses
7950X 250W
7900X 200W
7800X (not yet tested)
7600X 115W

And those are stock settings

In case of 7950X I wouldn't run it on one 8-pin (300W).

In fact, personally I wouldn't run any CPU past 100W on 1 since my PSU has 2 connectors.
I like things distributed.

 

[freeagent]

I use both of the plugs with my 5600X and 5900X. I too like a balanced setup

 

[fevgatos]

With Zen2/Zen3 the 2nd plug (usually an additional 4 pin) wasn't necessary.
View attachment 263303

No. A single 8pin eps can do 344w or thereabout. If your PSU is crappy, put both I guess.

Was running a clocked to hell 10900k with one 8pin. Unless you are doing LN2 ocing, temps will stop you before 1 8pin will.

 

[ir_cow]

A reviewer I saw yesterday was measuring the CPU EPS 12V rails connector for CPU power draw before VRM losses.
He didn't specify though if he plugged both, I'm guessing he did.

For the a Z690 ITX review, I was pulling 340 watts for 30 minutes. The cable got a bit warm, but thats about it. The main problem is a lot of these cheaper PSUs use 18AWG wire, you need 16AWG if you plan on drawing 300+ through on of these EPS cables.

 

[A Computer Guy]

Both the 7700X and 7600X use less than half the wattage a single eps can provide come on guys. Does that mean a motherboard maker wouldn't make the dumb decision to require both no but neither cpu will draw anywhere near what a single eps will provide and even if you pushed them there is no way in hell you could cool 300w on either cpu.

I was just watching a Hardware Unboxed review and it appears 7950x can pull 355 watts in Blender.

 

[Vario]

Both the 7700X and 7600X use less than half the wattage a single eps can provide come on guys. Does that mean a motherboard maker wouldn't make the dumb decision to require both no but neither cpu will draw anywhere near what a single eps will provide and even if you pushed them there is no way in hell you could cool 300w on either cpu.

Probably to add capacity for 7950X and maybe 7950X3D?

 

[oxrufiioxo]

I was just watching a Hardware Unboxed review and it appears 7950x can pull 355 watts in Blender.

That's total system power.

Probably to add capacity for 7950X and maybe 7950X3D?

Doubtful that the X3D uses more power. They would really need to go up to 24 cores to require the second 8 pin at least their mainstream chips.

You might be able to push your 12900KS past a single 8 pin with a heavy OC in prime95 with open loop cooling though.

 

[Zach_01]

I was just watching a Hardware Unboxed review and it appears 7950x can pull 355 watts in Blender.

That is total system power.

GamersNexus did the same measuring 12V EPS 8-pin connector(s) and find 250W. If you ditch VRM losses from that Its below 250W actual CPU package power.
I estimate around 220W for CPU PPT at around 90~95C.