[NAME]  Corrected. I had 3 screens and 11 tabs open and used the wrong one for your SSD. Yes to PCIe NVMe. And yes the 3200MHz will clock down to 2400MHz And if just adding 8GB to the 4GB already installed, only the first 4GB of the 8GB will run in Dual mode. The remaining 4GB will run in Single mode. Sorry for any confusion. Regards, U2
I have Dell Inspiron 15 3585 Ryzen 3 2300u with 4 GB RAM + 1 TB HDD. I want to upgrade by adding 8 GB RAM and 256 GB SSD (M.2 2280). Is it compatible with NVMe SSDs ? And my current RAM is DDR4 with 2400Mhz. I am thinking to add  Crucial RAM 8GB DDR4 3200MHz CL22 (or 2933MHz or 2666MHz) Laptop Memory CT8G4SFRA32A.  Can anyone please guide me.  
Want to upgrade my laptop, please help with suggestions.