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Brand new Samsung 970 EVO Plus 500GB running on PCIE 3 x2 instead x4!? Please help

Level 7
Hello yall, so i manage to save money to get myself a nice speedy Samsung 970 EVO Plus 500GB today. But the problem is my 970 EVO Plus is running on PCIE 3 x2 instead 4 report by Samsung Magician and CrystalDiskinfo! Speed read and write are in 1700ish MB/s. Anyone knows how to fix this?! I have the 970 EVO Plus install in M2_1 slot underneath cpu. And according to the manual, that slot is for pcie 3 x4 nvme drive.

Windows 10

ASUS ROG Strix X470-F

Ryzen 7 3700x

RX 590

4 sata 3 drives and 1 cd/dvd sata. Total is 5 sata devices.

Online manual here:

Bios manual here:

Customer Service Agent
Hi SumTingWong,
Do you install other devices in PCIE slot except RX 590 card?
Does it also occur on bios 5861 with bios all default settings?
Have you tried your Samsung 970 EVO Plus 500GB in other pc and other PCIE 3.0 x4 SSD in your pc to check the specifications and the speed?
Thank you.