sorry for the bump but same issue

Msi z270-a pro mobo
8gb ddr4
pentium g4620
4* 8gb rx480
1* 8gb rx580
win 7 x64

no tolud setting in bios, there is a 4g cryptocurrency setting that describes itself as allowing you to run several gpu's however with this on the system there is no video out

virtual memory set to 16gb, mines fine with 4 cards but adding the 5th gives error 21

any help would be appreciated