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Rx 570 showing n/a hashrate

I have a rig which i already have 4 rx 570’s up and running fine with the normal OC settings etc. When I put the 5th rx 570 hive sees it, reads its temp fan % but only shows a “n/a” for the hashrate. Then it resets over and over. I have taken off all the gpus except that one and still get the same thing. when I take it out all other gpus work perfect. I have flashed a stock bios but still the same problem. OC all settings to the same as the other working gpus. Everything is the rx 570 xfx …any ideas?? mother board is a riserless motherboard btc-s37 brand new. 1200watt psu