dual PSU adapters

[Proprietary]

For reasons, I need an external PSU for my graphics card. I read online that to use two PSUs in a single system, you need a dual-PSU adapter. I decided to go with this: https://www.amazon.com/BAY-Direct-Multiple-Connector-Ethereum-Connector/dp/B077VQL5NT/ref=sr_1_5?crid=3GFD15DFOW22N&keywords=dual+psu+adapter&qid=1556845444&s=electronics&sprefix=dual+psu,electronics,135&sr=1-5

However, it requires a 4-pin molex from my main PSU. My PSU is dell stock; I do not see anything that resembles a 4-pin molex... There are only CPU and motherboard connectors coming out. How do I get this 4-pin molex thing?

[TheBean]

you dont need that. if you just get a psu and plug only the pcie power to the gpu (you might need to jump the 24 pin not sure), it should work. I have seen some youtubers do this but i do not know the details or how exactly they did it. 

[Firewrath9]

you will need to jump 24 pin and plug PSU into all GPU connectors (!) if you don't, they might have different voltages and big no no.

thats why the dominus extreme has 2 power planes for the cpu connectors.

[aezakmi]

13 minutes ago, Saksham said:

you dont need that. if you just get a psu and plug only the pcie power to the gpu (you might need to jump the 24 pin not sure), it should work. I have seen some youtubers do this but i do not know the details or how exactly they did it. 

yeah according to youtube it "should work" but they completely ignore the load balancing part which means it doesn't works, at least not for a long period. 

 

Now for OP:

If you happen to have a group regulated PSU, cheap units use this system, basically single phase primary transformers that convert AC to DC12V and then use a couple of transistors (yes, two), few caps and resistors to retransform those 12V into 5 and 3.3, it's a fairly inefficient system but it works as long as the current load isn't too high (25, 30 amps with luck)

The last thing you should do is overload one of the transformers asking only for 12V which is what graphics card use and leave the others on zero, two things happen: little guy overheats and you get just too much ripple, in the short term (a few months maybe) you wouldn't notice problems but on the long run the stress you're putting on these transformers and filters will start being a problem, ripple and dirty power are your main concerns.

 

Honestly, if you don't know how or you're not willing to balance everything you shouldn't run a dual PSU system, it'll be easier and chaper to get a single higher wattage unit rather than doing this. I'm able to have an opinion since I've tried and ended up frying some old power supplies for the sake of experimenting with some old components, I'm also running on dual PSU now but my use is different and the load in A is probably lower, I only use it for 2 fans and a router (so I don't need a big external 12V power supply populating 2 of the UPS' outlets) I've also added a 48/24V circuit inside the same unit for heating and two Delta fans sometimes I used.

 

These adapters will only short the power on signal wire and a ground, nothing else.

[Proprietary]

I didn't want a dual-PSU system either, but my motherboard is dell stock. It needs a 8 pin mobo power supply and a 4 pin cpu power supply, which I don't have. Is there any way else I can use my new GPU...?

[Zagna]

16 minutes ago, Proprietary said:

I didn't want a dual-PSU system either, but my motherboard is dell stock. It needs a 8 pin mobo power supply and a 4 pin cpu power supply, which I don't have. Is there any way else I can use my new GPU...?

There exist Dell ATX adapters...