I've seen that some of you guys have problem with allocating DAG on 4GB cards. What mobos and configs do you use?

Never once i had encounter that problem and some of you have even switched to Linux because of this. I have a really huge virtual memory config and the HDMI to monitor is on the motherboard iGPU-port (and of course activated in BIOS). Maybe that is the reason that some experience an issue and some not. Windows doesnt allocate any memory to my gpus at all what i can see.
It is even possible to mine ETC at DAG #308 with total GPU memory usage at 3,56GB per GPU.

Can you who have problems with allocating DAG size please share your configs?

I have a rig with:

Windows 10 pro
Newest AMD drivers (19.11.3)
64GB virtual memory
Asus B250 Mining Expert
Intel core i5 6500

GPUs:
6x Sapphire Nitro RX470 4GB Mining Edition
2x Sapphire Nitro+ RX580 4GB
1x Sapphire Nitro+ RX580 8GB
1x MSI Radeon Vii 16gb