Virtualbox shows only 32-bit machine options

[Ralf Mardorf]

On Sun, 26 Jan 2020 14:24:31 +0000, Manish Jain wrote:
>My motherboard is Gigabyte B450 AORUS and its BIOS version is F5. How
>do I check if a newer BIOS exists, which hopefully will solve my
>problem ?

The available updates > F5 (from F30 to F50) provide descriptions:

https://www.gigabyte.com/Motherboard/B450-AORUS-PRO-rev-10/support#support-dl-bios