Intended use
Playing MMORPG games like Black Desert, ESO, etc..
Gaming Settings
High graphics on any stable fps over 30
Budget
hopefully under $700 but am willing to go over if necessary
Country
US
Potential Build Draft.

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CPU: AMD - Ryzen 3 1200 3.1GHz Quad-Core Processor

CPU Cooler: No clue if I even need one...

Motherboard ASRock - AB350M Micro ATX AM4 Motherboard (For now. Not sure if Motherboard really affects performace, would like to know more but this is what I came up with.)

Memory: Patriot - Viper Elite 8GB (2 x 4GB) DDR4-2800 Memory (Don't know how this works, this seems good, right?) * Storage:* Western Digital - Caviar Blue 320GB 3.5" 7200RPM Internal Hard Drive (Is this a decent RPM?)

GPU(Definitely the most important part for me): Asus - GeForce GTX 1060 6GB 6GB Turbo Video Card (costs around $275, not sure if it will be good.)

Case: Rosewill - Galaxy-01 ATX Mid Tower Case (Will this fit everything?)

Power Supply: Corsair - CSM 550W 80+ Gold Certified Semi-Modular ATX Power Supply (Is this an adequate supply?)

Optical Drive: None

Operating System: Windows 8.1 Pro 64-Bit (Heard that Windows 10 is better for gaming, but not sure if the change is worth the extra money.)

Additional Details
Is this an adequate build for high MMORPG gaming? Should I get a cooler? Currently its at around $670, I know that is cheap which is why I came here. I can give more information about anything if need be. Thanks!