which slots for ram
ASUS Prime B760M-A AX LGA 1700(Intel® 12th&13th Gen) microATX ...
To attempt to insert RAM or the main ATX power connector in any other fashion is to risk damaging the PCB which shows up as supposedly DOA boards or non-working DIMM slots.
How to Check How Much RAM Your Motherboard Can Support?
Additionally, not all motherboards have the same number of slots for dual or quad channel RAM, so you’ll need to make sure that your motherboard has enough slots for the amount of RAM you want to install.
Lenovo ThinkPad P50 | SSD & RAM Upgrades | crucial.com
Find compatible upgrades and system info for Lenovo ThinkPad P50. Discover RAM and SSD compatibility, slots, and max capacity.