Is it ok if “Above 4G Decoding” has a VarOffset of 0x2 ?

[SleepInfinity]

Hi everyone,

I'm analyzing the IFR for my motherboard's BIOS (AMI-based), and I'm trying to verify if it's okay for the "Above 4G Decoding" setting to have this structure:

OneOf Prompt: "Above 4G Decoding", Help: "Enables or Disables 64bit capable Devices to be Decoded in Above 4G Address Space (Only if System Supports 64 bit PCI Decoding).", 
QuestionFlags: 0x10, 
QuestionId: 0x12, 
VarStoreId: 0x1, 
VarOffset: 0x2, 
Flags: 0x10, 
Size: 8, 
Min: 0x0, Max: 0x0, Step: 0x0
    OneOfOption Option: "Disabled" Value: 0, Default, MfgDefault
    OneOfOption Option: "Enabled" Value: 1
End

This is inside the FormId: 0x40C ("PCI Subsystem Settings"), and it's currently grayed out due to:

GrayOutIf 
    EqIdVal QuestionId: 0x254, Value: 0x1

So is it valid/safe for this setting to use VarOffset: 0x2? I checked and it seems to not overlap any other variable in the same VarStoreId 0x1.

Any insight or confirmation from others who have modified similar settings would be appreciated. Just want to make sure this doesn’t break NVRAM structure or BIOS menu functionality.

Note : IFRExtractor produced 7 txt files from 0 to 6, and the Above 4G Decoding setting is only present in 2 of these 7 files.

Thanks in advance!

Motherbaord : Asus P8Z68 Deluxe Gen 3 (Z68 Chipset)
CPU : Core i7 3770 (non K version)
OS : Proxmox (Linux)
GPU : Intel Arc A770 16GB
BIOS file donwload : https://www.asus.com/supportonly/p8z68_deluxegen3/helpdesk_bios/