Background: Need to link 2 PSU so when I start the mobo they both start at the same time. right now i have been using Add2PSU solution, quite simple and very happy with it, but it cost $12.95 each + shipping, for the cost of powering this once in a blue moon, I think is not worth it.
Question: can i get away from it? how? could i just power the mobo PSU first and then the other PSU powering the 3 other cards after? without the physical link?
thanks in advanced
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I use PSU Jumper
https://images-na.ssl-images-amazon.com/images/I/21VppD4BMvL.jpg
All my EVGA comes with a ATX 24 pin cap with a jumper, isn't that the same thing? so how does it works? I connect the jumper and then when I switch it on it will start? do you have to switch the mobo PSU first, then start the comp, then switch the second PSU (the one with the jumper)? in that order?
http://aphnetworks.com/tutorials/psu_paperclip_trick
what it doesn't explain clearly is, green from main PSU to Green of secondary PSU or to Green/black from secondary...
https://www.reddit.com/r/litecoinmining/comments/1t07eu/so_heres_how_you_guys_can_save_power_on_psus_by/
I haven't got any issues running 2 psus per rig for years.
Am I missing something?
But yea, generally I'd advise for using this solution instead of going the cheap way and paper clippin it.
-paper clipping or bridging the green and ground connectors from the atx 24 connector, is you have to manually turn on and off PSU. and you have to turn this secondary PSU first, then mobo then start switch of mobo. (price of cable 25 cents)
-add2psu is all automatic, is like a slave PSU when it comes to on off functions. (price of device $12 + shipping)
To add the functionality of turning them all on with the paper clip solution is to run a green cable from main PSU to the other PSU green cable, if you want to distribute the load to the two PSU, you run green cable from secondary to green from primary and also the ground from seconday to ground of primary.
@Zorg33 you are not missing anything, just making sure im not throwing $ off the window
Can you please tell me what's the difference between the common grounds then?
I don't see the real difference, but I'm always open to new knowledge.
Thanks.
this are the ones i bought, i guess they are the same as hasher mentioned.
http://www.ebay.com/itm/Power-Supply-Adapter-Connector-Dual-Triple-Multiple-add2PSU-Relay-Adapter-Link/122061328703?_trksid=p2054502.c100227.m3827&_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=20160908103841&meid=59b8e1d72c0a4180aca300f1ea65af6e&pid=100227&rk=1&rkt=9&sd=122061328703
http://www.ebay.com/itm/6pin-6pin-Graphics-Power-Line-Dual-Triple-Power-Supply-Adapter-Connector-Relay/142041854850?_trksid=p2054502.c100227.m3827&_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=20160908103841&meid=03ba4d312ede4979a852b5c62f08ef46&pid=100227&rk=3&rkt=9&sd=122061328703
I think this is how it works, plug your psu probably a small 400 watts and link the ATX 24 to supply you get 2-6 pin connectors probably enough juice to power an 8 pin card, plus you get a molex connector too, the thing is that you have to turn the PSU on with a secondary switch on the card. if any of you try this let us know how it did go.
cheers
https://www.amazon.com/24-pin-Connector-Splitter-Dual-PSU-adapter/dp/B016P490UU/ref=sr_1_3?s=electronics&ie=UTF8&qid=1475736417&sr=1-3&keywords=dual+psu+connector
Turns both PSU on and off.
I buy custom made boards for ~ 7$, which have small load at 5V for the second PSU
@ali/ebay all I see are simple boards without such load
You don't need to ground them together because if you are using risers then the GPU shorts the GND anyways. So connect 1 or 2 GPUs with the PCIe 12V+ and Molex to different PSUs and they will be grounded.
Most important thing to remember is that if there is some fault and the main computer shuts off, the other PSU will remain running. When the PSU remains running without a load, it can burn out. So plug a small fan into the PSU to prevent this from happening.
And another important thing is to plug both PSUs to the same outlet in the wall, don't plug them in to different breakers.
and it's also important what restless says, to have some load on the 5V too.
You can avoid damage while running without load with a dummy load also on 12V. Then both voltages are loaded even while the rig is frozen/shut down.
I recomment a 5W 10Ohm resistor for 5V and a 10W 20Ohm resistor for 12V dummy load. You can simply plug it in the ATX24 connector (between yellow&black for 12V and between red&black for 5V)
FYI, the Add2PSU creates a common ground between two power supplies, so you've been following protocol all along if you are actually using such a gadget.
To answer your question: you are converting AC to DC voltage through the power supply transformer. You have a shared ground on the AC side, while your DC side is isolated hence the need to create another common ground for safety and stability.
There is some misunderstanding I think.
I guess you mean the AC zero line is isolated from the ground.
But the AC and DC ground is not isolated at all.
I measured at least 5 different PSUs and all have common ground with AC.
So all grounds in the psu are common.
My drawing is correct.
I built already a dozen of rigs with multiple PSUs and I also sell a lot of custom built server PSUs for farms.
It is a pretty good solution for many reasons. (price, scalability, robustness, etc)