2 PSU in 1 PC

PandaKun1205 · Feb 21, 2017

Motherboard : P55UDR3(very old)
CPU : Intel I5
Ram : 4 (the upgrade is coming)
Current PSU : Max Watt is 500w
I wanted to upgrade my gpu to GTX 780 ti which require the minimum of 600w
I have a old psu (max 430w)
Can I somehow combine the psu so that I have 430+500w to run a GTX 780 ti
Thanks in advance

Lopperuk · Feb 21, 2017

I've never heard of that before, you could probably wire them together somehow but sounds pretty risky. You should be fine with a quality 500w psu, it says 600w but it doesn't really require that much power unless you have some really cheap non-branded psu.

bignastyid · Feb 21, 2017

That just sounds like a fire waiting to happen. Best option is to get a good quality psu that is capable of powering the system by itself.

Kavinqt · Feb 21, 2017

The TDP of a 780 ti is 250watts, meaning it will never take over 250watts, I'd recommend buying around a 600+watt power supply with 80% efficiency above tier 3: http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html Don't try 2 power supplies, I've seen it work before on Scrap yard wars from Linustechtips, but It's not worth it lol.

PandaKun1205 · Feb 21, 2017

I heard a lot ppl use 2 psu and their pc still work fine after a couple year
So my second psu Max Watt is 430w
So should I be buying GTX780ti or GTX 760 which require a minimum of 500w
I don't really want to buy GTX 760 because of the performance
I'm on a budget so I won't be buying a new psu

BFG-9000 · Feb 21, 2017

This is easy enough to do, just splice the green wire from each 24-pin connector together.

I would make sure both PSUs share the same ground as well, by having them in the same metal case and perhaps splicing any one black wire from each together as well.

Would make the most sense to use the 8-pin from the PSU doing nothing else and the 6-pin from the PSU also powering the CPU/Mobo

bignastyid · Feb 21, 2017

Is it possible, yes. Is it a good idea? Not even remotely. If done improperly it can cause a fire, bodily harm or even kill you. They do make an adapter for tying 2 psus together but results are mixed and you will be putting your system at risk of being bricked. What's cheaper a good properly sized psu or a new system?

PandaKun1205 · Feb 21, 2017

So yea can I use GTX780ti with 500w?

PandaKun1205 · Feb 21, 2017

Can this be trusted
Or is this dangerous
http://www.instructables.com/id/More-power-for-your-pc-Second-PSU-Power-supply/step3/Turn-it-on-and-youre-done/?amp_page=true

BFG-9000 · Feb 21, 2017

PandaKun1205 :

If you follow those instructions, the 2nd PSU will never turn off. If you follow my instructions, the motherboard will turn on/off the 2nd supply at the same time as the 1st one when you use the power button.

Having the video card powered up when the motherboard is off could be dangerous.

King Dranzer · Feb 21, 2017

It is possible but is not recommended at that level. I did a workstation build with 2 PSUs as there was no 2500W PSU available to support it. One thing is that the wiring of 2 PSUs become hard. 2nd is that if one of them fails there is 15% chance the other gets down as well.

For that range of power requirement going for dual PSU setup is not recommended that too with old PSU. Get a single 650W PSU instead.

BFG-9000 · Feb 21, 2017

What's life without a little danger?

Easiest to use solderless T-Taps from car stereo or electronics store, to jump the wires green to green. Use the same PSU plugged into both motherboard 24-pin and 4-pin/8-pin EPS. If your other supply has both 8-pin and 6-pin PCIe you could use them to power just the video card.

Or buy a nice system pull Seasonic for $50

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