ROG Strix G16 (G614JI) RAID controller and PCIE 4.0 on secondary m.2 slot?

[a3x05]

Hi all, I'm planning to upgrade my G16 with two 990 pro drives, 2tb each.

I have 3 questions regarding that topic:

1. Does the G614JI have a dedicated RAID controller where RAID 0 imrpoves speed?
2. Are both m.2 slots PCIE 4.0?
3. Would the 990 pro with a heatsink fit - it looks rather slim, but I'm not sure?

I'll upgrade memory too which I already have at home (64GB Kingston) but I'd like to make the upgrades in one take so I haven't had the laptop open yet...

Any help is appreciated!

Thanks a lot in advance!