I have the following configuration
Asus prime Z270-p
Celeron 3930
4gb DDR4
6x RX480 (MSI gaming x 4gb version)
M.2 harddrive

When i try to use more than 3 card the system does not boot up(actualy does not even show up the bios press delete option if i recall correctly)

I have enabdled the above 4g decoding(newwest BIOS) and set all PCIE to gen 1. Is there anything else that needs to be set in order for 6 cards to work? I'm clueless what I'm doing wrong.