08-21-2017 04:04 AM - edited 08-21-2017 04:06 AM
Lenovo specs shows 1 socket, 8GB max.
Crucial is offering a 16GB stick for $142 US. This is outside of Lenovo spec.
You should explore other reasons for a sluggish machine. 8GB should work just fine.
Defrag HDD should be done. Windows>disk cleanup, etc.