Can you use two power supplies for a PC?

Question

Hello  I would like to know if we can use two power supplies for the same PC because I bought a graphics card and for me it requires a lot of power, so could you please advise me  Thanks in advance for your help  Best regards  theserialkiller10

max · Accepted Answer

hello 2 power supplies in a PC yes and no  I personally own three power supplies in my "MACHINE" of about 300 watts each  the wiring is not very difficult  one for the motherboard and the disk that contains the operating systems, one for the 2 IDE drives and the 4 RAID disks and cooling, and the last one for the 6 SCSI disks.   everything depends on the space in the case and the actual electrical needs, the simplest and safest option is to use a single, more powerful power supply.   recovering power supplies and tinkering (power-on commands, connecting them via relays for synchronized startup, creating a common ground, cutting the standard connector (the one going to the motherboard), identifying the wires and retrieving only those that correspond to the accessory needs   essential materials soldering iron electrical wires 12 volts or 5 volts relays terminal blocks heat shrink tubing multimeter  and a bit of knowledge and time   finally, it should be noted that a switching power supply is generally used most of the time at 40% of its capacity  there you go, quite a bit of tinkering

warex · Answer

lol unfortunately not  get yourself a powerful power supply, it will cost you around €50 but it's worth it. Get at least a 700

pieirg alias sas · Answer

hi  yeah you can, but you need a special tower with 2 power supplies or otherwise you can put together a basic tower or buy a more powerful power supply. However, I don't know if 2 basic power supplies can work together.   All I know is that there are ways to connect 2 power supplies, but I would be curious to know how.  see you later

warex · Answer

no don't worry it's impossible because there is a big white cable that connects to the motherboard and there is only one on the motherboards

theserialkiller10 · Answer

Thank you   but if we only connect the graphics card it would work   Thank you for your help

pieirg alias sas · Answer

Yes, it's possible; there are tours planned for that purpose, but they are super rare.  I believe they are server tours or something like that, but it exists.

warex · Answer

I wouldn’t recommend it there's a chance it might work and a chance it won't because if your power supply isn't strong enough to handle your graphics card, there's a good chance it will burn out your graphics card, so personally, I wouldn’t advise it, and to connect two power supplies, you would need a special and rare motherboard

epango · Answer

Hi,  What you need is a power supply with two PCI-Express power cables. They cost a bit more than those with just one. Here's a good power supply that's not too expensive and might suit you:  http://www.ldlc.com/fiche/PB00059311.html  500W is more than enough.  Good luck.

Claude Lachance · Answer

There is this kind of thing, but I think it’s less expensive to equip yourself with new stuff. http://www.ldlc.com/fiche/PB00041084.html   -- Potius mori quam foedari

ol · Answer

yes, it's doable ;) http://www.jackypc.com/index2.php3?rub=articles&num=12 http://www.jackypc.com/index2.php3?rub=articles&num=44

Drone84 · Answer

I'm sorry for digging this up, but I think it will help some people: Yes, you can use 2 power supplies or even more in your PC. Having an Advance 650W power supply and a future CF of HD7870, I powered my HD using the 2 6-pin connectors with a separate PC power supply. Everything else, including the HD powered by the motherboard, is powered by the Advance power supply. To turn on both power supplies at the same time, you will need a double power switch and all PC buttons are that way if the pins haven't been cut. Here is the diagram https://i82.servimg.com/u/f82/11/62/07/12/2_alim10.png The relay is powered by the first power supply so that when we turn on the PC, the first power supply is cut off, thus opening the circuit and the second power supply turns off in turn.  I did a first test with a 250W and the PC rebooted in a loop.  Currently, I have no issues.  Happy tinkering.

Claude Lachance · Answer

An Advance diet: good luck! -- I can only change my past in my future if I have already done so in its past.

Shooting Star93 · Answer

Yes, we can do it in 1 minute!! No need to mod or solder or anything... I bought a "GTX 570 Super Overclocked" graphics card and I have a Corsair HX620 Watts power supply. I have 4 HDDs + 4 fans + 1 sound card in my tower. Anyway, when I removed the HD 5770 ATI to replace it with the GTX, there wasn't enough power. The PC starts and shuts down even before the BIOS and its 3 characteristic beeps of the GPU. So I checked on the ASUS website to see how much my setup consumes and the result was: 850 watts!!! So I left only the SSD, removed the sound card... basically just the minimum in the PC and still no start!! I remembered I had a second power supply of 430 watts (new), I took it and connected 1 six-pin connector to the graphics card only and the Corsair 620 watts with 1 eight-pin connection. The second power supply is placed outside the tower and is not visible. I restarted and it's magical!! The monster of 28 cm (graphics card) lights up with all its LEDs (green), its 3 fans are running perfectly. No under-voltage observed and I reconnected my 3 HDDs + SSD, sound card... Anyway, it works perfectly!!! And this card is BEAUTIFUL!!

Claude Lachance · Answer

Hi  There is still a problem with your system because an HX620 is more than sufficient to run a computer like the one you describe, even when overclocked! In fact, without overclocking and if used normally (that is, not for running software that pushes the cards to their limits), you could power two GTX570s with an HX620. You should get that checked before a faulty motherboard or power supply damages the rest of your devices!  That said, yes, you can connect a second power supply without any problem. It has become more common in recent years with SLI and Crossfire. This topic is old.

Can you use two power supplies for a PC?

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