power delivery 8pin EPS Vs 8+4pin EPS (Vs 8+8pin)

[jackar]

I am buying new z390 motherboard for the upcoming 9900K, I plan to do moderate over lock once the guides come out.

 

I've noticed some boards come with 8pin EPS, some with 8+8 and some with 8+8.

I wonder if there is going to be any noticeable difference (lower vrm temps, more stable power delivery, ...) or any other advantage to running more then 8pin EPS, especially since we have been running x299 12c/24t on 8pin EPS motherboards without issue.

 

I would prefer 8+8pin mobo to 8+4 one, and I am thinking I will just buy 8pin one if no preferred 8+8 one exists.

 

Am I shooting myself in the foot by forgoing the additional EPS pins, or is the improvement marginal/PR, just like soldered dye turned out to be?

 

Thanks

[seon123]

Doesn't make a difference. It's just useless marketing crap, just like the M.2 heatsinks. 

[Jurrunio]

It depends on what wires your EPS cables has. If they are 18AWG wires then a single 8pin EPS can already give 480W of power (12V, 10A per pin on live wires, other half are ground wires). From currently available tests the 9900k doesnt pull more than 350w (or settings that can do that weren't tested yet), so a single 8pin EPS is totally enough.

 

If the wires are worse though.... Just get a new PSU. If you can afford a 9900k, the cost of a new PSU is merely pocket change.

[jackar]

32 minutes ago, seon123 said:

Doesn't make a difference. It's just useless marketing crap, just like the M.2 heatsinks. 

 

21 minutes ago, Jurrunio said:

It depends on what wires your EPS cables has. If they are 18AWG wires then a single 8pin EPS can already give 480W of power (12V, 10A per pin on live wires, other half are ground wires). From currently available tests the 9900k doesnt pull more than 350w (or settings that can do that weren't tested yet), so a single 8pin EPS is totally enough.

 

If the wires are worse though.... Just get a new PSU. If you can afford a 9900k, the cost of a new PSU is merely pocket change.

If I decide to go with 8+4 or 8+8, will it be necessary to populate both, or will single 8pin EPS cable suffice?

[seon123]

2 minutes ago, jackar said:

 

If I decide to go with 8+4 or 8+8, will it be necessary to populate both, or will single 8pin EPS cable suffice?

A single 8 pin will be fine. 

[Jurrunio]

2 minutes ago, jackar said:

 

If I decide to go with 8+4 or 8+8, will it be necessary to populate both, or will single 8pin EPS cable suffice?

if you have the cables, use all of them. The minimum is only 1 8pin, but you can certainly use more.