Using a second power supply WITHOUT connecting to mobo

jokers_greg · 07-23-08, 03:06 PM

I need to do a test run of my WC loop, without using the power supply in my computer. I have a 400W kicking around, and I thought to myself, why not use that? I don't know how to get it running without connecting it to the motherboard. The stickies have links that are about connecting two power supplies to one motherboard.

WonderingSoul · 07-23-08, 03:11 PM

Quote:

Originally Posted by jokers_greg

I need to do a test run of my WC loop, without using the power supply in my computer. I have a 400W kicking around, and I thought to myself, why not use that? I don't know how to get it running without connecting it to the motherboard. The stickies have links that are about connecting two power supplies to one motherboard.

Easy peasy! Jumper together the Green and Black on the 20/4 Pin connection. This can easily be done with a paper clip or any other kind of conductive wire.

Hitbox · 07-23-08, 03:26 PM

Quote:

Originally Posted by WonderingSoul

This can easily be done with a paper clip or any other kind of conductive wire.

Wont that kill him dead?

WonderingSoul · 07-23-08, 03:27 PM

Quote:

Originally Posted by Hitbox

Wont that kill him dead?

If you do it with the power on....

Hitbox · 07-23-08, 03:29 PM

Well the point is to try and get the power on. PSU's don't just turn on when you plug them in, obviously.

OP (and now I) want to know how to turn on the PSU without hooking it up to a motherboard, correct?

WonderingSoul · 07-23-08, 03:35 PM

Quote:

Originally Posted by Hitbox

Well the point is to try and get the power on. PSU's don't just turn on when you plug them in, obviously.

OP (and now I) want to know how to turn on the PSU without hooking it up to a motherboard, correct?

You jumper the PSU then use the back power switch to on/off the power... Following me?

Hitbox · 07-23-08, 03:41 PM

I get that, but you did say while it was on...

Quote:

Originally Posted by WonderingSoul

If you do it with the power on....

And to turn a computer on/off, the two mobo pins make a contact, but they don't stay contacted or else it does nothing (ie, holding the power button for 10 minutes).

Does that same concept not apply to the PSU?

WonderingSoul · 07-23-08, 04:00 PM

Quote:

Originally Posted by Hitbox

I get that, but you did say while it was on...

And to turn a computer on/off, the two mobo pins make a contact, but they don't stay contacted or else it does nothing (ie, holding the power button for 10 minutes).

Does that same concept not apply to the PSU?

I did not say do it while the power was on.

It's not like that. A computer power switch is a "jumper" to engage the power on and stay on.

I don't see why this is so hard to understand here... Jumper the unit together via Green to Black, and control the unit on and off with the back power switch.

Hitbox · 07-23-08, 07:43 PM

What if it doesn't have a rear switch?

iamcanadian7 · 07-23-08, 10:00 PM

Then you most likely have an older P/S, using the plug from the wall will act the same as a switch. Plug it in for "on" and unplug it for "off".

Roofles · 07-23-08, 10:11 PM

Quote:

Originally Posted by Hitbox

Wont that kill him dead?

No it won't. The explanation you want is this: The Green Wire is a signal wire, not a power supply wire. The switch on the case is called a momentary switch, all it does is connect this wire to ground. This tells the PSU to turn ON. So all he is doing is replacing the switch on the case with a paperclip. Shorting the +12V rail would be a bad idea, as it will probably fry a paperclip, but it won't kill you.

Blazing fire · 07-24-08, 02:31 AM

Quote:

Originally Posted by WonderingSoul

I did not say do it while the power was on.

It's not like that. A computer power switch is a "jumper" to engage the power on and stay on.

I don't see why this is so hard to understand here... Jumper the unit together via Green to Black, and control the unit on and off with the back power switch.

I don't mean to be offensive, but your explanation isn't that clear previously. Perhaps that's my because I'm young.

Let me rephrase and you tell me if I'm wrong.

When the green and black pins are connected, it will stay on. Therefore, insert the jumper and use the back switch to turn it off/on.

I basically rephrased "You jumper the PSU then use the back power switch to on/off the power... Following me?" but I added the jumper part.

chop_wood · 07-24-08, 04:04 AM

heheh.. i love to use the paperclip (even if i have a psu tester handy), and then pretend im getting electricuted infront of an unsuspecting client.

jokers_greg · 07-24-08, 08:06 AM

why is everyone so confused. From what I've read, (in one wonderingsoul post)+common sense, is that you need to follow these steps:

1)make sure the PSU you're trying to use is unplugged
2)connect the black and green pins on the atx connector with a wire
3)turn on the PSU or plug in the power cord (if you have no switch)

what is everyone asking about? lol

Blazing fire · 07-25-08, 03:10 AM

That is way clearer than any of the above post...

petteyg359 · 07-25-08, 09:16 AM

AFAIK, and from experience, you won't electrocute yourself by holding a paperclip to the green/black to turn it on. I've done this several times, with several power supplies, with my bare hand and a paperclip, and never been electrocuted. The green wire does not supply power, and the black wire is just a ground. If you're afraid of being electrocuted still, then just hold the paperclip with a clothespin or something. All you need is a momentary contact (while the power supply is plugged in and switched on) to start it. Stick the paperclip back in for 5 seconds or so and it will turn off. Just make very sure to only hit green and black or you're likely to fry something.

Hitbox · 07-25-08, 09:22 AM

Quote:

Originally Posted by petteyg359

All you need is a momentary contact (while the power supply is plugged in and switched on) to start it. Stick the paperclip back in for 5 seconds or so and it will turn off.

THATS what I was looking for! So keeping the paper clip in it will be like holding the power button down! OKAY! So it's no different then touching a screw driver to the motherboard connectors! Thanks Petty, that clears it up for me.

thideras · 07-25-08, 09:42 AM

You have to leave the "short" in to keep the PSU on, it isn't a momentary switch...

If you short green to ground, the PSU will turn on. If you remove that short, it will turn off. This is NOT like the motherboard power switch.

aznkc730 · 07-26-08, 04:04 AM

Quote:

Originally Posted by thideras

You have to leave the "short" in to keep the PSU on, it isn't a momentary switch...

If you short green to ground, the PSU will turn on. If you remove that short, it will turn off. This is NOT like the motherboard power switch.

that's exactly right. and here's a picture of how to jumper the connectors:

http://www.hardocp.com/image.html?im...lfMl81X2wuanBn

and believe me, there is no way to electrocute yourself while doing this. The PSU can be plugged in, the back power switch can be on, it doesn't matter. the connectors are sensors and do not carry any electric load.

zer0nix · 07-26-08, 11:06 AM

forgive me if this is off topic but how the hell do you 'fry' a paper clip? what happens? does it melt or break in two -or does something far more mysterious happen?

07-23-08, 03:06 PM	Thread Starter #1
jokers_greg Member Join Date: Jan 2005 Location: Mississauga, Ontario	Using a second power supply WITHOUT connecting to mobo I need to do a test run of my WC loop, without using the power supply in my computer. I have a 400W kicking around, and I thought to myself, why not use that? I don't know how to get it running without connecting it to the motherboard. The stickies have links that are about connecting two power supplies to one motherboard. __________________ Primary 3570k @4.6 turbo, P8Z77-V PRO , 6970 , Corsair Vengeance 4x4GB 1600 Vertex 4 120GB, 1x 250GB Seagate LG HL-DT-ST DVDRAM GSA-4167B, HX 850W , NZXT Switch 810 My OLD WC Project Log My Heat

07-23-08, 03:29 PM	#5
Hitbox Member Join Date: Jun 2008 Location: Winter Park, FL	Well the point is to try and get the power on. PSU's don't just turn on when you plug them in, obviously. OP (and now I) want to know how to turn on the PSU without hooking it up to a motherboard, correct? __________________ Windows 7 64-bit EVGA 750i FTW.......Silverstone KL02B-W E8400 @ 4.0 (9*450)....4x1GB DDR1066 Sapphire 4870.......500GB + 200GB HDD Add Newegg search to your Firefox!

07-23-08, 07:43 PM	#9
Hitbox Member Join Date: Jun 2008 Location: Winter Park, FL	What if it doesn't have a rear switch? __________________ Windows 7 64-bit EVGA 750i FTW.......Silverstone KL02B-W E8400 @ 4.0 (9*450)....4x1GB DDR1066 Sapphire 4870.......500GB + 200GB HDD Add Newegg search to your Firefox!

07-24-08, 04:04 AM	#13
chop_wood Member Join Date: Mar 2004 Location: San Diego, CA	heheh.. i love to use the paperclip (even if i have a psu tester handy), and then pretend im getting electricuted infront of an unsuspecting client. __________________ I5 2500K @ 4.9ghz\| Asrock z77 Extreme6 \| Crucial Ballistix Tracer 2x4gb @1866 \| 2gb MSI 6950 unlocked shaders 128gb Plextor M3 \| WD 11001FALS \| 620HX Corsair EK Supreme HF Nickel \| HD590 Sennheisers Laing D5 \| MCR-480qp \| EK SpinRes 4" ps1 lcd \| LIS2 Prem \| Lian Li PC2000v \| Yamakasi Catleap 27" \| Windows 8 HEATWARE

07-24-08, 08:06 AM	Thread Starter #14
jokers_greg Member Join Date: Jan 2005 Location: Mississauga, Ontario	why is everyone so confused. From what I've read, (in one wonderingsoul post)+common sense, is that you need to follow these steps: 1)make sure the PSU you're trying to use is unplugged 2)connect the black and green pins on the atx connector with a wire 3)turn on the PSU or plug in the power cord (if you have no switch) what is everyone asking about? lol __________________ Primary 3570k @4.6 turbo, P8Z77-V PRO , 6970 , Corsair Vengeance 4x4GB 1600 Vertex 4 120GB, 1x 250GB Seagate LG HL-DT-ST DVDRAM GSA-4167B, HX 850W , NZXT Switch 810 My OLD WC Project Log My Heat

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07-23-08, 10:00 PM	#10
iamcanadian7 Member Join Date: Sep 2007 Location: London, Ontario, Canada	Then you most likely have an older P/S, using the plug from the wall will act the same as a switch. Plug it in for "on" and unplug it for "off".

07-25-08, 03:10 AM	#15
Blazing fire Member Join Date: Sep 2007	That is way clearer than any of the above post... __________________ 1) Impact of tubing size --- 2) How to overclock an Intel CPU --- 3) Quad or Dual core? --- 4) P45 vs X48 using 2 4870 --- 5) 4Gb vs 2Gb --- 6) Advance RAM timing explained --- 7) DDR2 vs DDR3 --- 8) 1:1 vs 4:5 RAM strap --- 9) Using Rivatuner to overclock --- 10) Is Vista all that bad? --- 11) Favourite defragmenter --- 12) Single/Multi rail PSU --- 13) HDD compared --- 14) SDD explained --- 15) Threadings explained --- 16) How to choose a radiator --- 17) BIOS mumbo jumbo explained --- 18) How to attain best image quality in games (includes explanation of AA) Oc materials: realtemp, linpack & OCCT, memtest86, CPU-Z, 3dmark06, furmark, rivatuner, GPU-Z, Everest, memset. Welcome to the forums. Please read all of the forum rules. Thank you =) (courtesy to JoT)

07-25-08, 09:16 AM	#16
petteyg359 Join Date: Jul 2004 Location: University of Southern Mississippi	AFAIK, and from experience, you won't electrocute yourself by holding a paperclip to the green/black to turn it on. I've done this several times, with several power supplies, with my bare hand and a paperclip, and never been electrocuted. The green wire does not supply power, and the black wire is just a ground. If you're afraid of being electrocuted still, then just hold the paperclip with a clothespin or something. All you need is a momentary contact (while the power supply is plugged in and switched on) to start it. Stick the paperclip back in for 5 seconds or so and it will turn off. Just make very sure to only hit green and black or you're likely to fry something. __________________ MSI 890GXM-G65 - X6 1055T - 16GiB 10700 - 5850 1GiB - 7 Pro x64 / Gentoo amd64 - HX520 Dell XPS 15 L502x - i7 2760QM - 16GiB 12800 - GT 540M 2GiB - 7 Pro x64 / Gentoo amd64 - Agility 4 512GB [GB ≠ GiB] [MB ≠ MiB] [kB ≠ kiB] [1000 ≠ 1024] [Giga ≠ gram] [Mega ≠ milli] [Kelvin ≠ kilo] [Byte ≠ bit] "Apparently, Plaintiff believes that he could sue an egg company for fraud for labeling a carton of 12 eggs a “dozen,” because some bakers would view a “dozen” as including 13 items." - Western Digital 2006

07-25-08, 09:42 AM	#18
thideras Banned Neckbeard Moderator Premium Member #3 Join Date: May 2006 Location: South Dakota	You have to leave the "short" in to keep the PSU on, it isn't a momentary switch... If you short green to ground, the PSU will turn on. If you remove that short, it will turn off. This is NOT like the motherboard power switch. __________________ Desktop: Gigabyte Z77X-UD5H \| 3570k 4.6 GHz \| 32 GB GSkill Ares \| GTX 570 \| 180 GB Intel & 2 TB total \| Arch Linux and Windows 7 Main server: 37 TB raw disk \| 2x Opteron 6134 \| Asus KGPE-D16 \| 48 GB RAM \| LSI 8708EM2 \| CentOS 6.2 VM Server 1: Dell R510 \| 2x E5645 \| 128 GB RAM \| 4x 300 GB Velociraptor \| Xen Cloud Platform (XCP) VM Server 2: Dell R710 \| 2x E5645 \| 288 GB RAM \| 8x 300 GB Velociraptor \| Xen Cloud Platform (XCP) "That's not overkill, or a lot. That's just thiderastic." -txus.palacios Current projects: Rackmount Overkill (New) \| 30/45 hard drive server Articles: Rack Mounting 101 \| Dell Perc 5/i Throughput Benchmarks Past projects: Software RAID \| The Dragon Case My Website *Want to talk directly to all* the moderators at once? Call the Mod Hotline!**

07-26-08, 11:06 AM	#20
zer0nix Member Join Date: Mar 2005	forgive me if this is off topic but how the hell do you 'fry' a paper clip? what happens? does it melt or break in two -or does something far more mysterious happen?

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