This is what I run. I have two sticks in my rig for a total of 32GB
https://www.amazon.com/Corsair-Memory-2400MHz-SODIMM-CMSX16GX4M2A2400C16/dp/B019MRBKYG
I Just bought the 5100 myself, Its worth it imo. i have a 1gb connection, if i run snort, i go from 1100mbps down to 700mbps. which is still fast. i have 16gb of ram on the way for it. this is what i got https://www.amazon.com/Corsair-Memory-2400MHz-SODIMM-CMSX16GX4M2A2400C16/dp/B019MRBKYG