question regarding motherboard power pins - Overclock.net - An Overclocking Community

Forum Jump: 

question regarding motherboard power pins

 
Thread Tools
post #1 of 10 (permalink) Old 09-21-2019, 11:47 AM - Thread Starter
New to Overclock.net
 
IMKR's Avatar
 
Join Date: Oct 2013
Posts: 1,548
Rep: 38 (Unique: 28)
question regarding motherboard power pins

I was wondering if someone can clarify all the power pins on a mobo.

from my understanding, your basic build (modern) one has a 24 pin on the mobo. and the PSU has either 20+4 or a 24 pin to connect to the mobo.

the gpu will sit on the PCIE slot, and connect to the PSU via (usually for bigger ones) 6+2 pin.

however, it looks like mobos also have additional power pins.

mainly either a 1 x 4-pin ATX 12V power connector or a 1 x 8-pin ATX 12V Power connector.

what are these used for?

IMKR is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 09-21-2019, 11:51 AM
Senior OCN Member
 
shilka's Avatar
 
Join Date: Oct 2011
Location: Denmark
Posts: 38,201
Rep: 2749 (Unique: 1629)
The 4 and 8 pin you find on pretty much all modern motherboards are there as the 24 pin cant deliver enough power on its own for higher end CPU´s so it was invented to allow more power to the motherboard

Sometimes there is also an extra 4 pin ATX on top of the 8 pin but those are not needed unless you are doing extreme overclocking and by extreme i mean stuff you use LN2 and liquid helium for

Seravee
(30 items)
CPU
Intel Core I7 6850K
Motherboard
Gigabyte X99 Ultra Gaming
GPU
MSI RTX 2070 Super Gaming X Trio
RAM
Kingston HyperX DDR4 Savage 3000 MHz
Hard Drive
Samsung 840 Evo 500 GB
Hard Drive
Corsair Force MP510 1,92 TB
Hard Drive
Seagate Ironwolf Pro 14 TB
Hard Drive
Seagate Ironwolf 12 TB
Hard Drive
WD Ultrastar DC HC530 14 TB
Hard Drive
Seagate Ironwolf Pro 12 TB
Hard Drive
Seagate Ironwolf Pro 16 TB
Optical Drive
LG CH12NS30
Power Supply
Seasonic Prime Ultra Titanium 750 watt
Cooling
Noctua NH-D15S
Case
Phanteks Enthoo Luxe Tempered Glass
Operating System
Windows 7 Ultimate 64 bit
Operating System
Windows 10 Home 64 bit
Monitor
Asus PG279Q
Monitor
LG 55C8 OLED TV
Keyboard
Corsair Strafe RGB MK.2 with Cherry MX Silent
Mouse
Roccat Kone EMP
Mouse
HyperX Fury S XL
Audio
Sennheiser HD 598
Audio
Onkyo TX NR646
Audio
Dali Opticon Vokal
Audio
x2 Dali Opticon 2
Audio
x2 Dali Opticon 1
Audio
Dali E12 F Subwoofer
Audio
Sennheiser HD-599
Other
CableMod 30 CM Magnetic Red LED strip
▲ hide details ▲
shilka is offline  
post #3 of 10 (permalink) Old 09-21-2019, 06:31 PM - Thread Starter
New to Overclock.net
 
IMKR's Avatar
 
Join Date: Oct 2013
Posts: 1,548
Rep: 38 (Unique: 28)
Quote: Originally Posted by shilka View Post
The 4 and 8 pin you find on pretty much all modern motherboards are there as the 24 pin cant deliver enough power on its own for higher end CPU´s so it was invented to allow more power to the motherboard

Sometimes there is also an extra 4 pin ATX on top of the 8 pin but those are not needed unless you are doing extreme overclocking and by extreme i mean stuff you use LN2 and liquid helium for


does that mean if you dont plan on OCing your CPU, you can ignore the extra 4 and/or 8pin ATX 12v power connector?


also, how can i tell if a certain PSU comes wither either an extra 4 or 8 pin (Or both) ATX 12v power connector?

EDIT: sorry thats stupidly phrased. obviously from the PSU spec sheet. but i mean what am i supposed to look out for? looking at the supernova G2, it says main connector is 24 pin. and it doesnt have any other info (obvious ones) regarding extra CPU 4 and/or 8 pin connector. But i know this one SHOULD have 1, because when swapping this one from the seasonic gold focus, pcpartpicker doesnt give the compatibility error anymore seen here https://imgur.com/a/KxViBY6 for the seasonic gold focus


Last edited by IMKR; 09-21-2019 at 06:35 PM.
IMKR is offline  
Sponsored Links
Advertisement
 
post #4 of 10 (permalink) Old 09-21-2019, 07:49 PM
9 Cans of Ravioli
 
The Pook's Avatar
 
Join Date: May 2006
Posts: 16,756
Rep: 1099 (Unique: 636)
Any power supply you buy today will have a least a single 8-pin EPS.

The EVGA Supernova G2 product page does tell you what configuration it has.



Quote: Originally Posted by IMKR View Post
does that mean if you dont plan on OCing your CPU, you can ignore the extra 4 and/or 8pin ATX 12v power connector?


also, how can i tell if a certain PSU comes wither either an extra 4 or 8 pin (Or both) ATX 12v power connector?

EDIT: sorry thats stupidly phrased. obviously from the PSU spec sheet. but i mean what am i supposed to look out for? looking at the supernova G2, it says main connector is 24 pin. and it doesnt have any other info (obvious ones) regarding extra CPU 4 and/or 8 pin connector. But i know this one SHOULD have 1, because when swapping this one from the seasonic gold focus, pcpartpicker doesnt give the compatibility error anymore seen here https://imgur.com/a/KxViBY6 for the seasonic gold focus

If the board only has a single EPS connector then yes you need to use it, it's not optional.

If the board has two EPS connectors then usually you only need one. The motherboard will tell you which, but on ambient cooling you're never going to need both.

Intel i9 9900K Coffee Lake @ X8 5309mhz (+47.5%)
AMD FX-8320 Vishera @ X4 5022mhz (+43.5%)
Intel i5 4690K Haswell @ X4 5013mhz (+43.2%)
AMD X4 960T Zosma @ X6 4870mhz (+62.3%)
Intel i7 6700 Skylake @ X4 4709mhz (+38.5%)
Intel i5 6400 Skylake @ X4 4588mhz (+69.9%)
2 OP pls nerf
(24 items)
NUC U
(10 items)
CPU
i9 9900K
Motherboard
AsRock Z390 Taichi
GPU
MSI GTX 1080 Ti
RAM
G.Skill DDR4 4133 32GB
Hard Drive
Mushkin Pilot NVMe 1TB
Hard Drive
HP EX950 NVMe 2TB
Hard Drive
Samsung 860 Evo 1TB
Hard Drive
Sandisk Ultra II 480GB SSD
Hard Drive
Toshiba X300 5TB
Hard Drive
Western Digital EZRZ 3TB
Power Supply
Seasonic Focus Plus Gold 750w
Cooling
Corsair H115i Pro
Case
Fractal Design Meshify S2
Operating System
Windows 10 Education x64
Monitor
Acer XF270HU
Monitor
Dell E2311H
Keyboard
CoolerMaster MasterKeys Pro S
Mouse
Logitech G502
Audio
SMSL SA50 + FiiO E10K
Audio
Micca RB42
Audio
Polk Audio PSW111
Audio
Philips Fidelio X2
Audio
Philips SHP9500S
Audio
Audio Technica ATH-M50X
CPU
i3 8109U
Motherboard
Intel NUC8i3BEH
GPU
Iris Plus 655
RAM
Kingston 8GB DDR4 2400
Hard Drive
Dierka K1 120GB
Hard Drive
ADATA SU800 128GB M.2
Operating System
Windows 10 Professional
Operating System
MX Linux
Keyboard
Rii RKM709 Wireless
Mouse
Logitech M510
CPU
i7 860
Motherboard
Advantech AIMB 280 ITX
GPU
EVGA GTX 950 2GB
RAM
Kingston 2GB DDR3 1333
Hard Drive
Seagate Momentus 2.5" 500GB
Hard Drive
Western Digital Blue 2.5" 320GB
Power Supply
Silverstone SFX-L Gold 500w
Cooling
Arctic Alpine 11 GT 2
Case
Silverstone Milo Z ML07B
Operating System
Windows XP x86 SP3
Keyboard
Velocifire TKL01 Outemu Browns
Mouse
Logitech M512
▲ hide details ▲


The Pook is online now  
post #5 of 10 (permalink) Old 09-21-2019, 07:53 PM - Thread Starter
New to Overclock.net
 
IMKR's Avatar
 
Join Date: Oct 2013
Posts: 1,548
Rep: 38 (Unique: 28)
Ah cool i see it now. i was looking at the newegg page, and i couldnt tell what i was supposed to be looking for. looks like "EPS pin" is it. thx again!

does that "1x8pin, 1x8 pin (4+4)" mean that the G2 has both your standard 24 pin mobo connector, as well as one 8 pin connector AND another 8 pin thats a split with two 4 pins?

IMKR is offline  
post #6 of 10 (permalink) Old 09-21-2019, 08:27 PM
New to Overclock.net
 
Join Date: Jul 2019
Posts: 3
Rep: 0
I'm assuming your pcpartpicker link is referencing the CPU power connectors. So the 8 and/or 4 pin CPU power connectors. The wording would lead me to believe the board comes with an 8 pin and a 4 pin CPU power connector. Unless you're exceeding the limits of the single 8 pin CPU power connector you probably don't need to worry about this additional connector. Odds are this won't be the case. Unless you run into a problem while using the single 8 pin connector I wouldn't worry about it.

In regards to the G2 supernova.... It looks like the 750 watt and higher versions of the G2 come with two 8 pin CPU connectors on the back of the PSU and two 4+4 pin cables. It looks like the 550 and 650 watt versions come with one connector and one cable. If that answers your question.
Iridium31 is offline  
post #7 of 10 (permalink) Old 09-21-2019, 08:48 PM
Stock is too casual~
 
Veii's Avatar
 
Join Date: Aug 2018
Location: Austria / Bulgaria
Posts: 246
Rep: 11 (Unique: 9)
The top 4pin next to the 8pin IS used
It doesn't have to be XOC , it's used to offset ripple providing more stable current from two different rails (up to the psu) but it's used to just give more stability


Tho it surely is no requirement for any running system

Mojave#1 Ryzen Threadripper 1950x [email protected] ([email protected] with 105BLCK) + Liqtech 360 | ASRock X399 Taichi (3.23Beta) | G.Skill [email protected]3800CL14 | RX 580 Red Devil [email protected]/2200(micron) | Seasonic Focus Platinum | Samsung 960 EVO x2 & 860 Evo
Win#2 Ryzen 1700x @3.8 + Dark Rock 3 | X370 Taichi 1.0.0.3 ABBA by The Stilt (converted to X470) | Patriot Viper Steel (PVS416G400C9K)@3466C14 (64.2ns) | Hynix-MFR 3333CL14(72.5ns) / OLD | Gigabyte 970 G1 1595/1900(Hynix) | Samsung 850 Evo
Veii is offline  
post #8 of 10 (permalink) Old 09-22-2019, 03:17 AM
New to Overclock.net
 
Join Date: Aug 2019
Location: Kentucky
Posts: 77
Rep: 3 (Unique: 3)
Quote: Originally Posted by IMKR View Post
does that mean if you dont plan on OCing your CPU, you can ignore the extra 4 and/or 8pin ATX 12v power connector?

Use the 8 pin connector FIRST, you can ignore the extra 4 pins. But like Veii said it is used to offset ripple, you don't NEED to use it, not all MBs come with an extra 4 pin CPU connection, it's unlikely you'd notice any difference if you use it or not.


Quote: Originally Posted by IMKR View Post
does that "1x8pin, 1x8 pin (4+4)" mean that the G2 has both your standard 24 pin mobo connector, as well as one 8 pin connector AND another 8 pin thats a split with two 4 pins?

No, that spec means it comes with one 8 pin connector for the CPU, that connectors 8 pins are configured in 2 physical 4 pin connectors hence 1x8 pin (4+4) on the MB side, those go back to the PSU and are terminated by 1 physical 8 pin connector that plugs into the PSU. If you got 2 CPU cables with your PSU you could plug in both, use 1 complete CPU cable (1x8 pin (4x4)) for the 8 pin slot, then with the other cable you'd only use one of the two 4 pin connectors in the extra 4 pin slot on the MB and leave the other 4 pin connector just hanging loose.



I'm pretty sure I have an extra EVGA CPU cable around here somewhere if you really want to use that extra 4 pin connection on your MB you pay shipping and you can have the cable. Your PSU does have 2 CPU 8 pin connections. I make my own cables so I don't use most of the included EVGAs cables.

Open Air Build
(13 items)
CPU
i9
Motherboard
ASUS ROG Strix Z390-H Gaming
GPU
MSI GEFORCE GTX1080 TI GAMING X 11G
RAM
Corsair Vengeance LPX DDR4 DRAM 3000MHz
Hard Drive
Samsung 970 EVO
Hard Drive
WD Blue
Power Supply
EVGA SuperNOVA
Cooling
All PrimoChill parts (Rad 360, Pumps D5, Fittings, and Acrylic Tubing), Byskey CPU&GPU Blocks
Case
Praxis Wet Bench
Operating System
Windows 10 Pro
Monitor
Asus Predrator
Other
Thermaltake Commander F6 Fan Controller
Other
DIY Sleeved Cables
▲ hide details ▲
smilinjohn is offline  
post #9 of 10 (permalink) Old 09-22-2019, 05:03 AM
Overclocker in training
 
ThrashZone's Avatar
 
Join Date: Apr 2017
Posts: 7,523
Rep: 72 (Unique: 55)
Quote: Originally Posted by IMKR View Post
Ah cool i see it now. i was looking at the newegg page, and i couldnt tell what i was supposed to be looking for. looks like "EPS pin" is it. thx again!

does that "1x8pin, 1x8 pin (4+4)" mean that the G2 has both your standard 24 pin mobo connector, as well as one 8 pin connector AND another 8 pin thats a split with two 4 pins?
Hi,
All evga psu's have 8 pin cpu cables that are already split into 4+4
Combined them for 1-8 pin...

Gpu or VGA cables are all 6+2 for a single 8 pin connection x2 if two are needed I believe 4 total are included for sli and possible 6 can't remember.

Some like corsair make the user split the cable manually to 2x4 if they need one out of a 8 pin cable = pita.

CPU
i9-9940x With Heatkiller IV Pro and VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
Monitor
ASUS VG248QE 24" 144Hz
Keyboard
Logitech G910 Orion spectrum
Mouse
Redragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
CPU
i7-5930k with Heatkiller IV Pro Plexi-Copper and koolance vrm water blocks
Motherboard
X99 Sabertooth
GPU
EVGA 1080ti FTW3 with Water block
RAM
Trident-Z 3200C14 4x8gb's b-die default timings 14-14-14-34
Hard Drive
Samsung 970 Evo 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Power Supply
EVGA 1000-P2
Cooling
2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
Corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 and 10 pro Win-7 Primary os.
Monitor
AOC G2460PG 24"G-Sync 144Hz
Mouse
Red Dragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
Hard Drive
eLeaf MELO-3 4ml
Power Supply
SE US18650VTC6 3120mAh 30A 3.6V 18650 Li-ion Battery - GREENx4
Case
ANGIS Legion MOD 200w Geek Vape
Operating System
VapeWild RazzleBerry 50-50-0mg nic
▲ hide details ▲
ThrashZone is offline  
post #10 of 10 (permalink) Old 09-22-2019, 06:39 AM
New to Overclock.net
 
Join Date: Aug 2019
Location: Kentucky
Posts: 77
Rep: 3 (Unique: 3)
Quote: Originally Posted by ThrashZone View Post
Hi,
All evga psu's have 8 pin cpu cables that are already split into 4+4
Combined them for 1-8 pin...

Gpu or VGA cables are all 6+2 for a single 8 pin connection x2 if two are needed I believe 4 total are included for sli and possible 6 can't remember.


Depends on the model. My Platinum EVGA model came with a ton of cables, 2 CPU and 4 GPU if I remember right, my Gold EVGA 1 CPU and 2 GPU. And yes they split the GPU into a 6x2. I make my own cables so I just did two 8x8 with 16 wire combs and tapped into two GPU plugs at the PSU, for my CPU I just did an 8 pin instead of the two 4x4, much easier to mess with and it looks cleaner when sleeving cables.

Open Air Build
(13 items)
CPU
i9
Motherboard
ASUS ROG Strix Z390-H Gaming
GPU
MSI GEFORCE GTX1080 TI GAMING X 11G
RAM
Corsair Vengeance LPX DDR4 DRAM 3000MHz
Hard Drive
Samsung 970 EVO
Hard Drive
WD Blue
Power Supply
EVGA SuperNOVA
Cooling
All PrimoChill parts (Rad 360, Pumps D5, Fittings, and Acrylic Tubing), Byskey CPU&GPU Blocks
Case
Praxis Wet Bench
Operating System
Windows 10 Pro
Monitor
Asus Predrator
Other
Thermaltake Commander F6 Fan Controller
Other
DIY Sleeved Cables
▲ hide details ▲
smilinjohn is offline  
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Overclock.net - An Overclocking Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off