This is mainly a user-to-user forum. We have no way to know if/when BIOS and vBIOS updates may be available to support Resizable Bar on this PC model. All you can do is periodically check the G5 5000 drivers page for video card vBIOS and system BIOS updates. The update notes should indicate if they support Resizable BAR.
I have G5 5000 with 3060ti RTX card. But couldn't find VBIOS and M/B BIOS update for RTX30 series Resizable Bar. When will you update it for G5 5000 series users?
There is no Resizable Bar update for G5 5000(3060TI)?