PC running inconsistent. Don't know what to upgrade.

[Goompro]

Budget (including currency): €300

Country: Netherlands

Games, programs or workloads that it will be used for: Rainbow Six: Siege, Astroneer, Minecraft, Terraria, Assassin's Creed: Syndicate, Batman: Arkham Knight, GTA V, Destiny 2. (Just to name a few)

 

Current specs:

CPU: Intel Core i5-3470 @ 3.60Ghz

GPU: Strix AMD Radeon RX 470 (4GB)

RAM: 16 GB DDR3 (Dual-channel)

MOBO: Asus H61M-K

HDD 1: 466 GB (Western Digitial, 2011)

HDD 2: 1,8 TB (Samsung, 2010)

PSU: Cooler Master 600W 80plus

OS: Windows 10 Pro 64-bit

Stock coolers and 2 case fans, case with side panel removed for the time being.

Hi everyone. I got this PC second-hand for €300 a couple months ago. My PC is not performing as expected (e.g. frame drops on Astroneer and one HDD once died), thus I want to upgrade something. Games like Destiny 2 also run terribly, it can't even push 60 frames at 720p low settings. However, I'm quite unsure as to what I should upgrade.

 

I have some benchmarks from UserBenchmark, though. I think I need to upgrade at least my HDD and slap in an SSD as well, since they are severely outdated. Maybe my GPU as well, since that would be the worst performing component according to the benchmark.

For extra diagnosing, I also ran a FireStrike test, sorry for the terrible image quality on that one.

 

I'm aware my CPU is 8 years old, but it's still got 4 cores and a decent clock speed. It's also in good shape as you can see on the benchmark, so I'm not sure if my CPU is at fault here, but I could be wrong.

 

Any help is greatly appreciated!