Help getting 5 cards recognized

[IchibahnSLC]

I have a rig with 5 r9-270s in it and only 4 are being detected by the motherboard.  I know that only 4 are being detected by the motherboard because it is a MSI A88x-G43 which has a hardware display built into the uefi.  Has anyone had any experience with this problem?

[crazyates]

Try rotating GPUs to see if it's a GPU issue? Try rotating risers to see if it's a riser issue? Is your MB BIOS up to date? Does your MB need a PCIe presence mod? I use the PCIe USB risers, which have a built in presence mod.

[Starscream]

I have a rig with 5 r9-270s in it and only 4 are being detected by the motherboard.  I know that only 4 are being detected by the motherboard because it is a MSI A88x-G43 which has a hardware display built into the uefi.  Has anyone had any experience with this problem?

What PSU are you using and are you using powered risers?