Two PSU for one gpu !!!!

[OSBK]

i'm in my cousin's house and it's night so i can't buy or order anything, and we got a GTX980 we need to test. we don't have single power supply that can make it work so we're looking for different solutions. we have a 450W PSU but it doesn't have enough connectors but we have an external power supply that have an extra pcie connector. i know it is possible to use an external PSU for the GPU but what about two ? can i use two PSU to turn on one GPU ?

what i'm thinking is to connect both power supplies and turn on the external one first then turning the PC one, that's the case when it's a single external PSU for the the GPU would it still work by using two power supplies ?
i'm in a hurry we need to test it immediately, is there any solutions please ???!!! and thanks for the help ^-^

[RS2007GOD]

Try it and find out ?

[OSBK]

Just now, RS2007GOD said:

Try it and find out ?

let me re-phrase it, you mean fry it and find out ?? hehe
i can't act without infos !!

[corrado33]

I wouldn't. Unless the power supplies output exactly the same voltage, you'll get some current flowing where there isn't supposed to be current flowing if you connect one 8 pin from one power supply and one 6 or 8 pin from another. I'd try to power the board with one supply and the card with another. 

 

An even better solution would be to get an adapter to convert one of the existing available plugs on the 450W supply to the plug that you need.

 

I really don't think anything WOULD happen if you mixed power supplies, but I wouldn't do it just because the 960 is a nice enough card that I wouldn't want to ruin. Don't rush through things just to regret it later. 

[OSBK]

1 minute ago, corrado33 said:

I wouldn't. Unless the power supplies output exactly the same voltage, you'll get some current flowing where there isn't supposed to be current flowing if you connect one 8 pin from one power supply and one 6 or 8 pin from another. I'd try to power the board with one supply and the card with another. 

that's what i'm afraid of, powering them by separated PSU would work for sure if one of them have enough connectors. i have two of 2xMolex to 8pin connectors (4 molex in total) but the external power supply only have 2 molex and 2 Sata and one pcie 6pin, and that's the case for the 450W PSU. any suggestions ?

[Mikius10001]

5 minutes ago, Remon Salazar said:

let me re-phrase it, you mean fry it and find out ?? hehe
i can't act without infos !!

You CAN act without infos, you jsut want someone else to pass the blame off to if it breaks it.

 

That being said, I wouldn't suggest doing it. Maybe one PSU for everything, and another for the GPU itself, but I wouldn't mix them.

[corrado33]

4 minutes ago, Remon Salazar said:

that's what i'm afraid of, powering them by separated PSU would work for sure if one of them have enough connectors. i have two of 2xMolex to 8pin connectors (4 molex in total) but the external power supply only have 2 molex and 2 Sata and one pcie 6pin, and that's the case for the 450W PSU. any suggestions ?

What does the card need? An 8 pin and a 6 pin? 

 

Online info says it only needs a six pin...

 

I mean, obviously we KNOW that two power supplies CAN work in a single computer, from scrapyard wars and subsequently the free geek stuff where linus found those cables. But those are two regulated ATX power supplies. And I believe they used one for JUST powering the GPU and the other for JUST powering the board.

[OSBK]

Just now, corrado33 said:

What does the card need? An 8 pin and a 6 pin? 

two 8pins. and a little correction, the external PSU is 450W too and it has 3 molex not 2. and we did find another external PSU 300W with 3 molex 2 SATA and no pcie connectors.

[OSBK]

6 minutes ago, Mikius10001 said:

You CAN act without infos, you jsut want someone else to pass the blame off to if it breaks it.

 

That being said, I wouldn't suggest doing it. Maybe one PSU for everything, and another for the GPU itself, but I wouldn't mix them.

my problems is that the external PSU doesn't have enough connectors even with my 2-molex to 8pin connectors still not enough.

[corrado33]

1 minute ago, Remon Salazar said:

two 8pins. and a little correction, the external PSU is 450W too and it has 3 molex not 2. and we did find another external PSU 300W with 3 molex 2 SATA and no pcie connectors.

If you REALLY want to make it work, plug your 2 molex to 8 pin connector into 2 of the 450W molex, then go get some sata to molex adapters, and do the same thing again so you'll end up with 2 8 pin connectors. 

[Hulkbert]

12 minutes ago, Remon Salazar said:

let me re-phrase it, you mean fry it and find out ?? hehe
i can't act without infos !!

You could risk it and connect the gpu to one psu and the mobo+cpu to another one. But, I would try to see if you can get one power supply that meets your needs.

FYI I don't know if you know this but, if you ask us(the forum) for free help, keep in mind that we are not responsible if you follow our suggestions and screw something up.

[OSBK]

2 minutes ago, corrado33 said:

If you REALLY want to make it work, plug your 2 molex to 8 pin connector into 2 of the 450W molex, then go get some sata to molex adapters, and do the same thing again so you'll end up with 2 8 pin connectors. 

that's exactly what i was thinking right now, i don't know if my cousin have SATA to Molex so just in case, can i chop off the end of SATA connector and replace it with molex connector from another psu ??

[System Error Message]

Before you start plugging adapters into molex and sata (there is sata to 6 pin btw), the cable used for them will only carry a certain number of amps so make sure to use different strands.

[corrado33]

1 minute ago, Remon Salazar said:

that's exactly what i was thinking right now, i don't know if my cousin have SATA to Molex so just in case, can i chop off the end of SATA connector and replace it with molex connector from another psu ??

You can absolutely do that. Just make sure you keep the same colored wires connected to the same colored wires, and make sure they don't touch or you'll melt the wire, shut down the power supply, and possibly cause a fire and/or break the power supply.

[Hulkbert]

Before trying any of this, make sure you can't get ONE PSU for your whole system. If you can wait 2 days for amazon prime to get you a better psu or tomorrow morning you can go to a store that sells decent PSUs, then wait and don't potentially fry your whole system.

[OSBK]

2 minutes ago, Hulkbert said:

You could risk it and connect the gpu to one psu and the mobo+cpu to another one. But, I would try to see if you can get one power supply that meets your needs.

FYI I don't know if you know this but, if you ask us(the forum) for free help, keep in mind that we are not responsible if you follow our suggestions and screw something up.

it's like what Corrado33 said, i'll use the 450W PSU and use SATA as Molex. using one PSU for Mobo and an external one for the GPU is completely safe cause i did try it before and it worked well but using two external PSU for one Gpu including the different in voltage output is very risky. about the community part i'm not gonna blame anyone but myself but getting infos from the others is really helpful in the process

3 minutes ago, System Error Message said:

Before you start plugging adapters into molex and sata (there is sata to 6 pin btw), the cable used for them will only carry a certain number of amps so make sure to use different strands.

there is many adapters but as i said i can't order of buy anything online for the moment and there is no tech store near by, so i gotta mod the PSU and see how well it will perform.

4 minutes ago, corrado33 said:

You can absolutely do that. Just make sure you keep the same colored wires connected to the same colored wires, and make sure they don't touch or you'll melt the wire, shut down the power supply, and possibly cause a fire and/or break the power supply.

then i guess it's gonna work, i did use an external PSU before and it did work with zero problems the only difference is that i did have an extra evga psu back then. i'm thankful to nvidia that maxwell isn't that power hungry. thanks a lot man for the help.

3 minutes ago, Hulkbert said:

Before trying any of this, make sure you can't get ONE PSU for your whole system. If you can wait 2 days for amazon prime to get you a better psu or tomorrow morning you can go to a store that sells decent PSUs, then wait and don't potentially fry your whole system.

can't wait till tomorrow i gotta test the card now, cause i'm gonna going back home at 4am and as i said i can't order anything now and it won't get here in time anyway. i have three separated PSU one for GPU and one for Mobo and other stuff. this should work probably.

 

 

thanks for the help everyone one, i really appreciate it. and sorry for that long reply