5 Video Cards... only 4 (or less) detected

Chap-O

Prominent
Jun 26, 2017
2
0
510
So I've been messing around with this setup for 2 days now...

- 4 ASUS ROG STRIX RX 580 8GB + 1 ASUS DUAL RX 580 8GB
- Biostar TB250-BTC
- 4GB RAM
- Pentium 1151 CPU

NOTE: All cards and risers/cables/connectors have been tested

As noted in the title, I keep only getting reads on 4 of the cards. I've done all the following:

AMD Clean Utility + 17.6.2 Minimal Setup
Clean install of Windows 10
Swapped out hardware and used different combinations including the DUAL version
PCI PEX_X change (Auto, Gen1, Gen2, Gen3)

Any help would be appreciated :)

 

Chap-O

Prominent
Jun 26, 2017
2
0
510


I don't see anything on the BIOS for PCIe other than for the Speed (Auto, Gen1, Gen2, Gen3)

I have it set at Gen1 and previously tried Gen2... neither works.