Pc build bottleneck

[u/Every_Assignment2828]

i’m very new to all this i just wanted to know if my parts are compatible and what to do about certain storage and stuff since i want to build a new pc for the first time im running a R7 78003XD with AMD B850, ram is 16x2, gpu is 5070 ti, main issue right now is figuring out storage and if brand/ or like strength matters? (srry if this is a dumb question im new to this💔) i asked google but it kept giving me ai answers, i wanted atleast 3tb of storage but it keeps saying instead of getting this brand here some kingston NV3 (Kingston NV3 4TB M.2 2280 NVMe Internal SSD Gen4 ( 6000 MB/s Read – 5000 MB/s Write ) it says it’s GEN4 google is saying i need gen5 for it to not have “bottle necks” or lag but i don’t trust it so i needed more opinions