So I'm on to like my third mining rig and up until now I have been using Intel, and using the exact same set up except for one rig where I have a motherboard specifically for the 3060s. Anyways so I decided to build my next rig this time using AMD chip and mining both AMD and Nvidia GPU's.

So far I have been able to get three cards going. Two Nvidia cards and one AMD. It will recognize all the cards if I only plug three in, no matter which three it will recognize it, but if I add more than three it will not recognize it in device manager. The fans turn on and everything so they are getting power.

I have changed all the bios settings that I am aware of, these including 4G decoding, crypto mining, PCI i.e. link speeds (I have tried Gen 1, Gen 2 and Gen 3 but to no avail).I have tried turning both on and off CSM, but no change either way. I am unaware of any other settings to adjust.

Any and all help would be greatly appreciated!
Thank you

(I had forgotten to add "gaming plus Max" to the motherboard description so I redid the post)

I just built my rig. I am new to all of this. This is my parts list: ASUS Prime Z390-P LGA 1151, Intel Core i5-8400, 2xCrucial RAM 16GB DDR4 2666 MHz CL19, 1xSabrent 256GB ROCKET NVMe PCIe M.2 2280, 1xEVGA Supernova 1600 G+, 80+ Gold 1600W PSU and Cooler Master Hyper 212 EVO CPU cooler.

 Everything was put together and booted up on the first try. My CPU has a IGPU, the UHD 630, and that's what I am using to get my display from. I then started to add the GPU's one by one.(each time I added a GPU I turned off the system first) Yes they are on risers. Doing it one by one I was able to get 4xGPU's on risers to work without any trouble, the whole time my display coming from the CPU IGPU. When I go to add the fifth GPU, the screen goes all fuzzy gray except for a couple of slits of proper display where I can see that it has booted up in the bios. If I try to connect my display to one of the GPU's that was connected prior to the fifth one being added I do not get any video. Since the screen goes fuzzy gray when it's connected to the IGPU, I cannot tell why it has loaded into the bios.

 Any and all help would be greatly appreciated. This is my first time so I did not change any of the bios settings before installing anything and I didn't do anything to Windows either except for the basic things like not needing a password and not going to sleep etc. All of my GPU's are Nvidia and range from a 1070 TI, 20's series and 30's series.

Thanks for all the help in advance!

Edit: This was solved!