Build Advice Replacement beside GPU

[DynV]

I recently got an RX 590 (GV-RX590GAMING-8GD: GIGABYTE Radeon RX 590 Rev. 2.0 DirectX 12 8GB 256-Bit GDDR5 PCI Express 3.0 x16 CrossFireX Support ATX Video Card) which I installed on a 3 yo system, see specs below. FO4 (fallout 4) is at medium settings and there's some lag. I'm thinking about selling the rest of that system and get a new one. If the storage speed is good perhaps I should keep it and buy a smaller one for the system I'd sell. [see post #5 update 2 for the strike-through reason] RX 590 documentation recommend 500 W and the 3 yo system has 450, so I'd get a new PSU. Any recommendation? I'd like something between low & medium price range. The following is what I'm thinking of selling:
GA-B150M-DS3H: GIGABYTE LGA 1151 Intel B150 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard (rev. 1.0)
BX80662I36100: Intel Core i3-6100 3M 3.7 GHz LGA 1151 Desktop Processor
GPR416GB3000C15ADC: GeIL EVO POTENZA 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 3000 (PC4 24000) Desktop Memory Model
CX450M: Corsair CX Series 450W ATX 12V 80 Plus Bronze Certified Modular Power Supply
CT275MX300SSD4: Crucial MX300 M.2 2280 275GB TLC Internal Solid State Drive (SSD)

Thank you kindly

Moderators: I'm using FF 74.0 on Win 10 1909 and I can't change the font size nor make a list (in this post).

Update 1:
Strike-through and note about the storage speed.

Update 2:
Moot thread.

 

[CountMike]

That CPU is real bottleneck if not even a pain in the neck.

 

[DynV]

I'm asking for a suggestion to replace everything but the GPU... Actually I'm thinking of keeping the storage, but I need some storage to put in the system I'd sell. [The storage is to be sold as well]

Update 1:
Strike-through and note about the storage.

Update 2:
Moot thread.

 

[Zoel.fahmi]

I'm asking for a suggestion to replace everything but the GPU... Actually I'm thinking of keeping the storage, but I need some storage to put in the system I'd sell.

How much your budget?

 

[DynV]

As in the OP: I'd like something between low & medium price range. Since the GPU nor storage wouldn't be replaced, I think 350 400 CAD should be enough, 400 450 worse case.

Update 1:
At the time of the post 350 CAD = 243.16 USD = 226.70 € 400 CAD = 279.17 USD = 260.53 €. Also, if the motherboard won't be significantly more expensive, I'd like it to include graphics; so in a couple years if I decide to keep the GPU but sell the rest, I don't need to find the system a GPU.

Update 2:
Strike-through and replacements about storage & budget. I realized the storage I got isn't as fast as I thought, thus want it to be replaced along (so everything but the GPU).

Update 3:
Moot thread.