Should I buy more ram..? help please!

Computer Type: PC/Desktop
System Manufacturer/Model Number: Custom Build
OS: Windows 10 Home x64
CPU: AMD FX-8320 @ 3.5 GHz
Motherboard: Gigabyte GA-990FXA-UD3 (rev. 4.0)
Memory: 4 x 2 GB G Skill Ripjaws DDR3-1600
Graphics Card: EVGA Nvidia GTX 550 Ti 1 GB
Sound Card: Realtek
Monitor(s) Displays: Acer S201HL
Screen Resolution: 1600x900
Keyboard: Microsoft
Mouse: HP
PSU: Silverstone Strider 750w Modular
Case: Antec 300 Illusion
Cooling: Air
Hard Drives: 1 x 240 GB OCZ SSD 1 x 60 GB Intel SSD 1 x 1 TB Samsung HDD
Browser: Google Chrome
Antivirus: Microsoft Security Essentials

Computer Type: PC/Desktop
System Manufacturer/Model Number: Skylake Special #666
OS: Windows 10 Pro x64
CPU: Intel Core i7 6700K
Motherboard: Asus Sabertooth Z170 Mark 1
Memory: GSkill TridentZ RGB 16GB 3600 16-16-16-36
Graphics Card: EVGA GTX 980 Ti SC x2
Sound Card: Realtek High Definition
Monitor(s) Displays: AOC G2460PG
Screen Resolution: 1920 x 1080 144Hz
Keyboard: Logitech G910 Orion Spectrum
Mouse: Logitech G700s
PSU: EVGA 1000 P2, EVGA White Custom Braided Cables
Case: Corsair Vengeance C70 Gunmetal Black
Cooling: Corsair H100i v2, Corsair ML120 x2, Thermal Grizzly Kryonaut
Hard Drives: Samsung 860 Pro 256GB, Seagate Barracuda 4TB x2
Internet Speed: Verizon Fios Quantum Gateway 75/75
Browser: Chrome
Antivirus: Windows Defender, Malwarebytes Free 3.8.3
Other Info: Corsair SP120 x4, LG Blu-ray Drive, Durabrand HT-395 100 Watt Dolby Digital Amp, Corsair H2100 Wireless 7.1 Headset