Boot with 3 gpus - not boot with 4

[qwerty92]

  Hi everyone,
I'm trying to set up a rig with 3 1070 and one 1060.
Motherboard is a msi z270 pc mate with g4400 Intel cpu.
I don't get any issue with 3 card (no matter if only 1070 or mixed) but when I plug the 4th windows doesn't boot...
Bios see the card but when windows is loading I get "no signal" and just one card stop the fan (all card have fan stop at low temperature)
PSU is a 1000W corsair rmi
All is running on win 10 pro full updated
I just do the following:
- update bios
- install Nvidia driver
- delete Nvidia driver
- pcie to gen1
- latency to 64
- riser and gpu work well in all combination with 3 gpus
- I tried also with 4G set on but it still not working
This is making me crazy.
Can anyone help me?
Thank you.

[BTC22]

I'd bet your PSU doesn't have enough power. How much RAM do you have?

[qwerty92]

I'd bet your PSU doesn't have enough power. How much RAM do you have?

I think 1000W with a good corsair PSU it's enough.
I have 4 GB and 16GB virtual memory

[leonix007]

Ensure that it is indeed a shutdown, I am thinking that its just installing the 4th card and normally will do a blank screen while installing it and it take a few minutes. Also check your Risers, if you have extras try to replace them.

Also got this info from MSI website with this particular board..

I wonder if its the cause.

** The PCI_E2/ PCI_E5 slot will be unavailable when an expansion card has been installed in the PCI_E3/ PCI1 slot.


https://www.msi.com/Motherboard/Z270-PC-MATE/Specification

[qwerty92]

Ensure that it is indeed a shutdown, I am thinking that its just installing the 4th card and normally will do a blank screen while installing it and it take a few minutes. Also check your Risers, if you have extras try to replace them.

Also got this info from MSI website with this particular board..

I wonder if its the cause.

** The PCI_E2/ PCI_E5 slot will be unavailable when an expansion card has been installed in the PCI_E3/ PCI1 slot.


https://www.msi.com/Motherboard/Z270-PC-MATE/Specification

NOW I get 4 gpu without driver but when I install Nvidia driver I get 3 gpus working good and one with errors 43 on pcie e-3... the card works well if I install just it...
I don't think msi advice has effect on it but I'm not sure