Helios 300 PH317-53 not booting up

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Abhinash
Abhinash Member Posts: 7 New User
Hey guys.
My model is Helios 300 PH317-53.
I just upgraded it with 2TB NVMe.
The problem starts when I what to use 2 NVMe, the old WD 257 GB and new PNY XLR8 2TB.
So, when I boot with 2 SSD in RST with optane or RST Premium with optane, the laptop doesn't boots up and keeps restarting every 10 secs in Boot screen.
But, when I change the mode from RST to AHCI, everything works fine. The laptops boots up and works fine with getting Read and Write speed upto 3GB.
Since, it works fine with AHCI, I don't have any problem. 
But I have question, which is why with 2 NVMe and RST mode my laptop doesn't boots up and keeps restarting ?