My PC can read all my RAM, but isn't using it all?

pf1235

Reputable
Mar 15, 2014
43
0
4,540
Hey guys, I do youtube videos and use Adobe Premiere Elements. I have 16 GB of ram, and adobe uses about 4 GB of it. For some reason, it makes my PC lag, even though I still have 12 GB.

Mobo: Asrock Extreme9/ac
RAM: G.Skill Sniper 16 GB
 

pf1235

Reputable
Mar 15, 2014
43
0
4,540
Motherboard: Asrock Extreme9/ac
Graphics Card: EVGA 780 TI Superclocked
RAM: G.Skill Sniper 16 GB (8GBx2)
Power Supply: Corsair 860i (860W)
Hard Drive: 2x 2 TB HDD, 120 GB SSD, 500 GB SSD
Optical drive: LG M-Disc
Case: Cooler Master Cosmos SE
Operating System: Windows 8.1