I've tried to enable 4G but screen freezes when it loads the smOS but after disabling the 4G it loads the smOS but wouldn't start the miner also in smOS dashboard I only see 4 gpus out of 6
I'm just spit-balling here, but how much memory do you have installed? "Above 4G Decoding," after all, refers to accessing in excess of 4GB of memory for mapping of PCIe devices.
I've got 4gb installed but so far rig is stable after new installation of windows and drivers.