Trouble setting up RX 470 rig with simplemining OS and Hive OS - error 0xc000022

[velma]

I have a rig with Prime z270-a motherboard

I'm putting RX 470 cards on it, but having trouble.

For the overclocking in Simplemining OS, I set Core MHz to 1050, Memory MHz to 1950 and Core undervolt to 900.  Powerstage is set at 6 and minimum fan speed is 70%.

I'm also using two separate power supplies that are linked together. The  1000 watt PSU is running five cards, and a 450 W PSU is operating two cards.

When I try just one card with no other cards in a single PCI-E slot, it will drop the wattage to 35W and the heat will spike to 85°C.

I had card number one in PCI slot number one and it worked for 24 hours just fine. I try hooking up the first two cards and one of them will drop to 35 W and give me the heat spike.

I just hooked up cards 2, 3 and four and had been working fine. I tried number five and received a message saying that my keyboard was not detected and it wouldn't work. I pulled card 5 off and now I'm getting an error 0xc0000225. 2, 3 and 4 cards were working and now it is giving me an error. If I pull the cards off, it goes back to my screen to go to the bios.

Just to note: I received this error before when I tried another motherboard. I was also using an SSD drive and was using Hive OS. I switched to  another motherboard and a USB and Simplemining OS, but just received this error and having the same issues where wattage drops and the heat spikes.

I have also tried just running the 1000 W PSU by itself.

I don't know what to do. If anyone has suggestions I would appreciate it.

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[rikuu]

is the heat spike always hapening on the same card?

Regarding not being able to connect more than 4 GPUs, is the BIOS option "encode above 4G" enabled?

How do you set the voltage on the GPUs?

[P00P135]

Do you get these errors when you don't OC and undervolting them?

[Broomey]

Hey. Sorry to hear about your temp and crashing issues..
It does sound hardware related and not software though. I would suggest to strip it right back. I personally use PiMP OS, but that shouldn't matter for this testing.
Try booting it with just 1 gpu (not the 35w one) and 1 psu connected.
Try making sure you have either the standard Rom, or only PBE One-Click mod ONLY.
As rikuu said, ditch the undervolting for now. Tune later.
Try a little more conservative setting, maybe 1025 and 1900? I have some 4gb rx470's (Hynix mem), running only PBE1C, 1025, 2025, NO UNDERVOLT, and getting 28.2mh/s@52w on ETH.
If you try the above.. run it for a day or 2 to see temps and stability.. then add a card. Slowly slowly.. you'll get to the bottom of it.
When you do find the issue and your rig's running stable.. then you play a little with undervolting to maximise your return.
Best of luck.. happy mining!