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Help configure slow 990 pro 4tb on Maximus XI Extreme

Level 8

Help mates,

Had to replace my m.2 nvme (1tb970Evo) with a newer 4tb 990 Pro,
B U T getting real slow speeds (compared to the old 970.
According to Samsung Magician
Sequential Read 2997 MB/s
Sequential Write 2908 MB/s

So I need your help configuring the new 990 pro in bios!
(And yes, I only run the single 990 pro in the m2_1 spot. And DIMM.2 is empty/free)

Should also point out that altho on budget and stuck with current rig I am dreaming of an newer graphic card so I understand as much as to only occupy my XI Extreme with only the single m.2 in spot m2_1.

But I am stuck and need your expertize mates,
how should I configure bios to get better speeds on the new nvme 990 pro m.2?