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Started by Zordrack | | 9 answers
Dual power supply system
Hello,

I need some advices for my new build on how to split the charge between my two psu. I thought that I would hook the cpu and two gpu on the 1050w and the rest on the 850w.

I plan on overclocking the cpu and gpu so I don't want to run into any power shortage problems.

I was also thinking about getting the corsair 1500axi but I'd rather not spend 500$ on it if my 1050hx and 850tx can do the job.
Thank you

Motherboard asus rampage v x99 Cpu i7 5930k
Gpu 3way gtx980
Memory 8x4gb ddr4 2133
Psu dual psu corsair 1050hx and 850tx
Hdd 4xhdd
Ssd 2xssd
Custom liquid cooling pmp-500 pump
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October 16, 2014 12:51:34 PM

Ok thank you. I'm glad that I ask you first before doing something stupid :) 
a b ) Power supply
October 16, 2014 12:25:35 PM

We usea secondary power supply for the pump, fans and lights, but never for system components..

Bitcoin miners use secondary psu to power their gpu's, but they dont turn them off... Like normal usage.
October 16, 2014 12:20:28 PM

Rookie_Mib, I was gonna use http://www.add2psu.com to power on both psu no need to cut the wires.

The only option left for me is to stick with the 1050w or get the 1500w if it's not recommended to use two psu on the same system.

Best solution chosen by Zordrack

October 16, 2014 12:11:08 PM

Um, I would highly advisa against what you propose. primarily because the motherboard only has one PSU connector and there's no easy way to send a power on signal to the second PSU. Even if you devised a way to send the signals to the second PSU, you might also run into weird grounding issues which would put your sensitive electronics at risk.

In all honesty, you're much much better off doing 2 way SLI and using the 1050 and overclocking that if you want. or just use the 3way at stock speeds. Or with a modest overclock. 80% of 1050 is about 840W assuming you have a good quality power supply. aim to stay about that level for maximum efficiency.
October 16, 2014 11:07:06 AM

I believe http://www.newegg.com/Product/Product.aspx?Item=9SIA297... this is what you need so both supplies come up at the same time.

However, some PSUs have line sensing that will shut the PSU off if it's not picking up enough draw from the main ATX cable to avoid burning out drives and expansion cards if it thinks the mobo's not working.

Also a bit wary personally about mis-matched wattages, but that's from my experience with redundant supplies in servers. Since you're not running redundant it may not matter.
October 16, 2014 11:03:24 AM

I've never heard of a dual PSU system... It's certainly unique, if even reasonable.

Anyway, I'm pretty sure you can fit all 3 980's and the cpu on one PSU. According to PCPartpicker, http://pcpartpicker.com/p/GXTVLk your maximum wattage for the CPU, mobo, RAM, and 3 GPU's should be around 740W. Which would mean that your 1050W would be sufficient, even with HDDs, fans, and overclocking.

I highly suggest you consider sticking with just the 1050W
October 16, 2014 11:02:36 AM

It would be theoretically possible to do, what you would need to do is:

1) mount the darn thing (right?)
2) take the sencondary PSU ATX power connector, cut every wire off except the green (signal on) wire and one black wire.
3) connect those to the corresponding wires on the other ATX connector.

That would allow both power supplies to power on via the normal power on/reset button pushes. Then, I would run two GPU's off one PSU (probably smaller PSU), the system and one GPU off the other PSU.

That being said, the 980s are pretty darn efficient, are you absolutely sure the 1050hx wouldn't power it alone?
a b ) Power supply
October 16, 2014 11:00:57 AM

1000watts can be used for the Gpu's, cpu, Mobo and drives

850watts can be used for the cooling..

Its not really recommend to separately power the components.

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