My SSD writes and reads at absolutely rubbish speeds!

Hi guys, I built my very first pc yesterday (and a day after here comes my first post...). The spec is as follows

x470 gaming plus mobo
ryzen 2600x cpu
rx 480 8GB gpu
kingston a400 480GB SSD
1TB HDD
2x8GB Corsair Vengeance lpx 3000mhz ram

I never had an SSD before but the instructions on connections were the same as on HDD, grab sata 3.0 cable and connect it to sata 3.0 port (all 6 of my ports are sata 3.0 so could not go wrong here). I formatted the entire system, installed Win 10 and...

My SSD writes and reads at absolutely rubbish speeds!