In case anyone is interested. Here's the inside of a Dell Inspiron 15 i5570-5364SLV-PUS that I'm doing a SSD transplant into. This is the newest model with the i5-8250U.
Picture here (sorry, my picture reference keeps getting broken)
As you can see, it comes with a single 8GB stick of DDR4-2400 RAM (CPUz reports CAS 17), second slot is open. M.2 2280 slot is open. Seagate 1TB hdd. The touchscreen "IPS" screen is lackluster, so much so that I have a hard time believing its not TN.
Seems like a solid product for $500.....**EXCEPT**.... I can't for the life of me get the darn thing to recognize any boot drives in UEFI boot mode. I've got two tested working bootable Win10 flash drives and it doesn't recognize either until I remove the Secure Boot and PTT, enable legacy ROM, and set boot mode to legacy instead of UEFI. Then it all works just fine. I even tried formatting the SSD (Samsung 850 EVO) on my main rig, then dropping it into the laptop and it still will only detect the bootable drive in legacy mode. Updated bios from 1.1.3 to 1.1.4 and no improvement. (See Update below)