Help me! Motherboards MSI H310 Pro 13 PCI

I have a MSI H310 Pro main but only get 4 GPU max, add more GPUs and it crashes! If anyone can fix this error, please guide me!
Thank you very much!
Sorry I don’t know much english!

Click Settings; I think its at the Boot sub-menu, Look for "Above 4G " – ENABLE for more than 4 GPU’s.

Standard first step for your problem.