Frame rate problems , need help and advice

[Le_Joshi]

So for some reason my games have had noticeable decline of FPS. When I first put together this PC (Not too long ago), everything has been running smoothly and loading pretty quickly but over time, my games that ran easily with 200+ FPS are now at a minimum 160 and sometimes can take a nosedive to 60 or 40. My guess is my missing BOOT, causing latency and the only thing I have for storage is a Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive . Been looking up online for a good SSD for sale but before I make the purchase I wanna make sure it's the source of my problem and not something else. Any help or advice would be greatly appreciated 

 

Here are my PC parts just in case:

 

PCPartPicker Part List

Type	Item	Price
CPU	AMD Ryzen 5 3600X 3.8 GHz 6-Core Processor	$208.99 @ Amazon
Motherboard	MSI MAG B550 TOMAHAWK ATX AM4 Motherboard	$179.99 @ Newegg
Memory	G.Skill Ripjaws V 8 GB (1 x 8 GB) DDR4-3600 CL19 Memory	$31.99 @ Newegg
Memory	G.Skill Ripjaws V 8 GB (1 x 8 GB) DDR4-3600 CL19 Memory	$31.99 @ Newegg
Storage	Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive	$54.99 @ Newegg
Video Card	MSI GeForce RTX 2070 SUPER 8 GB GAMING X Video Card	$549.99 @ Newegg
Case	Fractal Design Meshify C ATX Mid Tower Case	$97.98 @ Newegg
Power Supply	Thermaltake Toughpower GX1 600 W 80+ Gold Certified ATX Power Supply	$84.99 @ Newegg
	Prices include shipping, taxes, rebates, and discounts
	Total	$1240.91
	Generated by PCPartPicker 2020-09-02 20:51 EDT-0400

[Helpful Tech Witch]

Did you buy a 2x8 kit of memory or 2 1x8 kits?

Did you really spend $20 more for the x on the end of the 3600 name?

WHY THE ACTUAL FUCK DID YOU BUILD A 1000+ BUILD IN 2020/2019 WITHOUT A SSD?
What games?

[Le_Joshi]

I bought a 2x8 kit of memory 

 

It was on special on day I made the purchased, actually bought it 15$ dollars off 

 

Yeah lol, I didn't think the storage would matter long as it had a lot of space. Guess it did lol

[StyvyStiefel]

Is the cooler lose? What do your temps look like when you play a game?

[Le_Joshi]

No, it's firmly attached and the temps never rise above 65+