Problem with msi b250 PC MATE installing more then 2 Graphic cards

[AminElEl]

OK i am using win10 64bit, sata HDD, and B250 PC MATE by MSI.
Problem is next:
When i connect rx480 to PCIe1 and r9 370 to PCIe4 everything is working perfect, but when i try to connect one more r9 370 with rise cable nothing happens. i tried all combinations and cable is working,but with 2 GPUs.

 

[theriver56]

That board does not support 3 way crossfire.

 

[AminElEl]

i dont need 3 way crossfire i need mining rig with 2 same and one different card all of them amd

 

[AminElEl]

ok i was able to connect r9 370 rx480 and hd7950 on a mobo, now i need to figure out why the hell 2 of r9's and rx doesent work

 

[tyron.bennett]

Hey,

Dont know if this has been answered but if you read the manual you will see that some of the PCIe slots are disabled if you use the other. Slot 2 is disabled if you have something in 5 or something like that. That is because there are only so many busses available on the card. With rizers I can get 3 cards working, but not a 4th. Im looking for a solution since according to the specs I should be able to get a 4th going, but probably thats the max.