GPU # 1
GPU's MODEL NAME:Gigabyte Gaming g1 rx 470
VRAM: 4GB
CORE/MEMORY CLOCK: 1290/1850 (Oc Mod bios)
HASHRATE: 300 H/s
MINER SOFTWARE: Claymore Zcash miner 12.1
OS: W10

GPU # 2
GPU's MODEL NAME: Sapphire HD 7950 Vapor X
VRAM: 3GB
CORE/MEMORY CLOCK: 1000/1250
HASHRATE: 260
MINER SOFTWARE: Claymore Zcash miner 12.1
OS: W10

I bought this MOBO, 2 days ago, i were using a 1155 mobo for mining with my 2 gpu's One Sapphire 7950 Vapor X, and a Gigabyte Rx 470 G1

The problem is the next, I want to mine with those 2 gpu's and use a Gtx 550 Nvidia card to play and work. The thing is, i connect the 470 on the main pci-e x16 and the 7950 on the riser, and works fine, but when i connect the Gtx on the main pci-e, The 470 stays undetected, and the 7950 with problems of handling values in MSI Afterburner.

Any ideas to what is happening or what i need to do?

P.D. I cleaned the risers before installation, Everything is practicly new, (Less the 7950)