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Hey guys.. if anyone has any insight.. I would jump for joy.

I have an 8 card 1070 rig on an MSI Z170 Gaming mobo powered by two Corsair 850’s.  8gb of ram and a Pentium G4600 running Windows 10. Drawing 1050 watts from the wall dual mining ETH+DCR.

The rig seems completely stable but here is the issue. At some point – could be 12 hours, could be one week – claymore will crash and when it restarts it only fires up 4 GPU’s, the ones connected to PSU #1. If I restart the computer, claymore/windows loads with 5 GPU’s. 4 off PSU#1 and one off PSU#2. The other 3 do not get recognized no matter what I do. The solution? All I have to do is shutdown, wait 15-20 seconds, restart and we’re back up to 8 GPU’s.

This has been going on for weeks and I can’t figure out why the GPUs disappear and why only 5 are detected on a restart and I have to do a complete shutdown for everything to work again. It's making remote management extremely difficult.  ???

Whenever i've had problems like this, power supplies have been the culprit. I'd probably try taking a card or two out, and seeing if stability improves- then go from there once you've ruled power stability out or confirmed it's the problem.

Maybe you should just go for a single more powerfull PSU, maybe that would solve your problem.

Are you sure PSU#2 switches on properly after the crash and restart?

It does because I get the 5th GPU. I just don't understand why it would suddenly give out, and on restart only power on one of the 4 GPU's? It's only using 50-60% of the 850w. I can't understand why restarting only fires up 1 GPU but powering down and powering on gets all 4 going?

Got to be something to do with the restart and shutdown sequence differences. Maybe turn off "fast reboot" or whatever similar option in the bios/uefi?

How is PSU#1 connected to PSU #2?

Adaptor or cable extension. 

Do you still have the problem if you manually power off both PSU's and then power on #1 and then #2.

I can try that.


It's connected through Add2PSU. I have two other rigs with 1060's powered by 750w G2's. Let me know what you think of this. The G2's fan is always spinning and the PSU is very cool to the touch. On the system with the Corsair 850w PSU, the second PSU isn't drawing that much power so its energy saving feature doesn't have it's fan spinning very often. When I touch it, it's very hot. When the fan does spin, it cools down. I'm guessing it has it's own threshold for when to cool itself down. The first PSU draws more power and it's fan is running 90% of the time and is cool to the touch. I was wondering if because the second PSU doesn't get enough load, it gets too hot and perhaps it shuts down? Would that make any sense? It didn't really make sense to me, but then again it's hotter than I would like.

If the "hot" psu has a switch to turn the fan on (i.e.turn off eco mode) then its worth a try.

I was hoping it would. The EVGA G2's have the option to turn it on/off. The Corsair is fully automatic.  :-\

Have you considered opting for a single 1500 watts PSU, that should do the trick.