Yeah, the alot of settings are tied together on the MSI board.  If the 4G is enabled, UEFI is automatically enabled as well and it won't let you independently switch the UEFI to Legacy Mode.  If 4G is disabled, legacy mode is available, but then there is a 4 GPU limit.

I'm using a MSI H310-F Pro Mining Board with 13 pci-e slots

Hoping someone can help me out with a UEFI boot issue using SMOS.

I've created a SMOS usb drive using etcher.  But my motherboard defaults to UEFI mode when I enable 4G decoding.  The SMOS usb drive I created will not boot under UEFI.  I'm trying to find out how to create a UEFI bootable SMOS usb drive.  Any help would be great, thanks!

'I want to link my Bitcointalk name with BTCJam's. Verification code: a453af8e-b1c0-40ee-93ab-06052bcaae1c'