PCIe GEN 3 slot with PCIe gen 2 controller causing anomalous

Best SSD for gaming in 2024 gen4 ssd in gen 3 slot BUT you go buy the off brand no name cheaper 1TB Gen 4 NVME for lets say, 70$ (6-7K read slot til salg fyn Kinda odd he spent nearly 4 minutes talking about the difference between Gen 3 and Gen 4

agen138 slot SSD Price in Bangladesh 2024 ; Western Digital Green SN350 240GB NVMe Gen3 SSD Interface: PCIe Gen3 8Gbs; Form Factor 2280; Sequential Read: 2400MBs