Problem found, fix in next release
Sorry to revive this thread, but didnt this bug come back in meantime? I just noticed that my RX580 8GB shows up to 4GB in "memory used (dedicated)" , latest 2.27.0 and latest drivers 19.12.1. Win7x64
Not sure if someone else with AMD/RX500 can confirm this, if this is indeed gpuz/driver bug.
Sad thing is I cant guarantee my card isn't messed up, as I bought it used from miner, so dunno if it couldn't be 4GB and he just flashed 8GB bios when selling or something like that (but I kind of doubt he would get 4GB for mining)
Reason why I started looking into this was that Jedi Fallen Order keeps randomly rebooting my PC, so I kind of suspected gpu/vram. Strange thing is that even when I run MSI kombustor furmark donut 6500MB test it shows just around 2GB usage. For bellow load I tried unigine superposition 8K which says it should use 6GB, also few other games I quickly tested never gets above 4GB in there.