Using dual PSU's please help!

[Mat in the hat]

I have two 980 Ti's with a i7 7700k, which i believe would pull too many watts since it is OC'd. I have a dilemma, one 980 Ti uses two 6+2-pin power cords which comes from my 650 watt PSU (Modular). The second GPU uses one 6-pin and one 8-pin power cord, I have a secondary PSU which is 500 watts (Non modular) that has only two 6-pin power cords. So, the question is, can i use the 6-pin from the 500 watt on the second GPU,  and an 8-pin power cord from the 650 watt? (The 650 watt has three 6+2-pin power cords). I will probably buy an "Add2psu" adapter for the second PSU. I'm sorry for the confusing post I just need help because i can't afford another PSU and don't want to fry anything. 

[Skiiwee29]

Power is power, it wont care where its coming from, as long as its getting the proper power. So yes, in theory, your plan should work. 

[Fasauceome]

What are the make and model of these power supplies?

3 minutes ago, Mat in the hat said:

I have a secondary PSU which is 500 watts (Non modular) that has only two 6-pin power cords

Is that in total or just on one PCIe power cable? I use a dual 6 pin to 8 pin if this happens to me.

[Mat in the hat]

650 Watt - three 6+2- pin power cords

500 watt - two 6-pin power cords

My first GPU will be powered by the two 6+2- pin power cords from the 650 watt

And i'm trying to power my second one up using one 6-pin power cord from the 500 watt PSU and the third 6+2-pin power cord from the 650 Watt PSU, so the second GPU will have a cord from both PSU's I wanted to know if it was safe. I do have an dual 6-pin to 8-pin power adapter, but then ill have to use a 6+2- pin power cord from the 650 watt. So, either way I have to use a cord from each PSU  Skiiwee29 said it should work. What do you think?

[Mat in the hat]

Also, do I need a "Add2PSU" for them to power up..or is it just the safest way?

[scottyseng]

1 minute ago, Mat in the hat said:

Also, do I need a "Add2PSU" for them to power up..or is it just the safest way?

Yeah, otherwise you have to find some way to trip the second PSU to turn on. The adapter is way easier to deal with

[Fasauceome]

2 minutes ago, Mat in the hat said:

650 Watt - three 6+2- pin power cords

500 watt - two 6-pin power cords

My first GPU will be powered by the two 6+2- pin power cords from the 650 watt

And i'm trying to power my second one up using one 6-pin power cord from the 500 watt PSU and the third 6+2-pin power cord from the 650 Watt PSU, so the second GPU will have a cord from both PSU's I wanted to know if it was safe. I do have an dual 6-pin to 8-pin power adapter, but then ill have to use a 6+2- pin power cord from the 650 watt. So, either way I have to use a cord from each PSU  Skiiwee29 said it should work. What do you think?

I did something similar with my brother's 780 lol, it works and it was a little funny too because I was running both our systems off our PSUs combined. The 6+2 pins from the 650 watt PSU and the 6 pin from the 500 watt will combine effectively. As long as both power supplies are switched on so all the power is delivered, you're good.

(and don't forget, use @skiwee29, although mine won't turn orange for some reason)

[Crunchy Dragon]

2 minutes ago, fasauceome said:

I did something similar with my brother's 780 lol, it works and it was a little funny too because I was running both our systems off our PSUs combined. The 6+2 pins from the 650 watt PSU and the 6 pin from the 500 watt will combine effectively. As long as both power supplies are switched on so all the power is delivered, you're good.

Austin Evans did something very similar to this in that one season of Scrapyard Wars he was in.

[Mat in the hat]

THANK YOU SO MUCH, I've never had an account :') I've only lurked! You people are super helpful and informational!.

[Crunchy Dragon]

Just now, Mat in the hat said:

THANK YOU SO MUCH, I've never had an account :') I've only lurked! You people are super helpful and informational!.

Glad we could be of help, and welcome to the forums!

[Mat in the hat]

@

• Crunchy Dragon YES this is where I had gotten the idea from!

[LukeSavenije]

@Crunchy Dragon iirc linus did say in a different video (at freegeek) that he should have used some kind of a cable to link both

[Crunchy Dragon]

1 minute ago, LukeSavenije said:

@Crunchy Dragon iirc linus did say in a different video (at freegeek) that he should have used some kind of a cable to link both

Most likely.

[Mat in the hat]

I'm thinking this is a good adapter right? https://www.amazon.com/gp/product/B07BK3TCCS/ref=ox_sc_act_title_1?smid=A8CV72D2OP6QC&psc=1

@Crunchy Dragon @fasauceome

[Crunchy Dragon]

7 minutes ago, Mat in the hat said:

I'm thinking this is a good adapter right? https://www.amazon.com/gp/product/B07BK3TCCS/ref=ox_sc_act_title_1?smid=A8CV72D2OP6QC&psc=1

@Crunchy Dragon @fasauceome

I'm not sure about that one.

 

Ideally you might want something more like this: https://www.amazon.com/Optimal-Shop-Second-Motherboard-Adapter/dp/B07543LNRH

[Mat in the hat]

@ Crunchy Dragon Darn, I figured it would be the same!, I would buy the molex one but my 650 watt doesnt have molex. I'm looking into the one you gave me

[comicsansms]

Don't do this. If you don't have a good enough PSU to do SLI, just don't do it. It's just as simple as that. I'm pretty sure @TheRandomness fried a GPU doing this, and he knows what he is doing.

 

What are your PSUs?

Where are you from?

What stores do you buy stuff from?

[Mat in the hat]

@Comic_Sans_MS What

 

[Mat in the hat]

@Comic_Sans_MS650 watt gold 

and a 500 watt standard.... USA CA. And usually online

 

[Mat in the hat]

@fasauceome Did you do it just as I described, or how did you do yours? @Comic_Sans_MS is saying it'll fry my gpu. I need help guys im a college student on a cheap budget

[Fasauceome]

Just now, Mat in the hat said:

Did you do it just as I described, or how did you do yours?

I highly doubt any frying would happen, but more specifically, my own system setup was different, as it was one PSU sharing power with another and two systems were running off two PSUs.

[Mat in the hat]

@fasauceome should i use the 500 watt to power the mother board and the 650 to power the two gpus? i just don't know what to do then

[Fasauceome]

1 minute ago, Mat in the hat said:

@fasauceome should i use the 500 watt to power the mother board and the 650 to power the two gpus? i just don't know what to do then

I like @Crunchy Dragon's idea with the dual 24 pin, but if you're iffy on the process my real recommendation is to only use a power supply that has the appropriate connectors for the job, as a rule of thumb.

[Mat in the hat]

@fasauceome I really hope there is no risk..i have two things coming in the mail, another 6+2- pin power cable and some psu sync, should i just use the 500 to power my cpu and mobo, hard drives and the 650 for the cards?

[Mat in the hat]

@fasauceome Thats the sync i have coming in the mail!