@Humpleupagus @phnt @Suiseiseki @matty @nugger @sapphire @EllisDee NVMe is always gonna be faster than SATA, both in latency and throughput
you have 4 lanes of PCIe so 4 or 8GB/s rather than 6Gb/s over SATA
there's no SATA controller, nor the necessity to limit communication with the SSD to ATA commands
it's (likely) linked direct to the CPU so there's no chipset in the middle splitting the bandwidth up between multiple devices on the bus