Hello, around July I plan to buy new gaming pc. I'm fine playing games on medium and low settings (prefer medium). I wish to play following games:

D:OS 2 (I have it on steam)
Pillars Of Eternity 2
Ghost of a Tale
Mages of Mystralia (steam version)
Crusaders Kings 2 (steam)
Middle Earth Shadows of Mordor (I got free steam key)
Pathfinder RPG: Kingmaker
Bard's Tale IV

I would prefer my config to be around 680 euro. I plan to build my pc. Since I live in Croatia, I'm simply asking a guidance. Should I opt for four core pc or eight core pc? 8 gb of ram or less? SSD or HDD? That's sort of thing. I would prefer AMD graphic card.

More. Both.

I think I don't need both ssd and hdd, but isn't 8gb of ram enough'

Yes, you need both (or 2 SSDs, but that would be quite expensive). 8GB is the minimum, but because right now prices of RAM are very high, just buy only 1 stick of RAM with 8 GB capacity. You should also wait till there are new versions of CPUs not affected by Meltdown & Spectre available.

Hello,

RAM: While 8GB will be fine for the games you listed (except maybe Bard's Tale IV), you may want to look at 16GB for and optimal setup. Personally, I don't play many games that require too much ram but when I start multitasking those 16GB start to shine.

SSD or HDD: I'm running an HDD-only system, I can tolerate waiting a few seconds more and focus my budget on more important hardware. That said, SSD's are cheap now and with a 680€ it's up to you whether you can fit it in that amount.

CPU: Honestly the games you listed will run even on a dual core with hyper threading. However for your budget I'd say that a Quad Core + Hyper/Multi Threading CPU is doable. An AMD Ryzen 1500 is a great processor for the price, however keep in mind that on the 12th of this February the 2400G (an improved version of the same model for the same price) will be available.

AMD GPU: For your kind of budget, I guess you're looking at an RX570 which is slightly better than an Nvidia 1050Ti.

Many people (like myself) also like to have the OS on a separate drive (usually the SSD) and everything else on the other drive.

I do as well but I just partion the drive into 2. Adding a second drives up the costs while the poster is on a budget.

Good point.

Those aren't demanding games but like others said I would go for 16GB of RAM anyway, as more and more games are eating up more and more RAM. One could say the same for VRAM with many games getting "ultra" texture settings, but that would be more of a high-end thing I suppose.

For what it's worth I built a new PC a couple months ago and with much research went for an AMD Ryzen 1600 CPU, 16GB of RAM and an nVidia GTX 1060 6GB.

8GB of RAM will be ok, particulary given the current inflated prices of RAM due to global shortage just now. I recently built my kids a gaming PC and only once have I encountered a problem with gaming due to having 8GB RAM - even this was just a warning at the beginning of the game (Just Cause 3) and didn't seem to adversely effect the game. I asked on some forums regarding gaming with 8GB of RAM and it seems that the issues with Just Cause 3 are a one off. It wasn't that long ago that 8GB was the standard for a gaming PC and many are still gaming with that with no issues.

An SSD is essential for Windows to be installed on. Otherwise, your PC will feel slow and sluggish. Upgrading from an HDD to an SSD for your operating system is one of the most noticeale upgrades you can do to a PC. Most people go for a modest SSD capacity (between 120 and 250GB) and then have a larger HDD (1 or 2 TB) along with it.

4 cores will be enough for the forseeable future. It will still be a few years down the line before game developers start to take advantage of more cores.

It's going to be difficult to build the PC with your budget if I'm honest. If you need to save money you could even go for a Kabylake Pentium G4560 processor. It is only a 2 core processor but has 4 threads, is clocked at a decent 3.5 GHZ and will be fine for gaming - the cost in terms of frames per second compared to a 4 core processor wiill usually be less 10 frames per second in games. It only costs £65 brand new! This is the processor I have in my kids gaming PC.

Getting a graphics card is absolutely going to be your biggest challenge I'm afraid. Because of the mining craze, most GPUs are selling for more than double the recommended retail price. The effect is lessened somewhat for the more entry level cards but it may be a good idea to try and get a second hand GPU (although prices are also inflated for those!). You can only hope that my July either the mining craze has eased a bit or that manuacturors have caught up with demand be making lots of more cards.

Best of luck with it anyway!

Why separate disk or partition for the os? I mean instead of os + programs on the same ssd/partition?

One reason, not that it's often an issue, but having the OS on a separate drive from your data is 'neater' if you want/need to reinstall the OS.

Thanks for clarifying, with the Windows 10 being full of surprises I will have to think about it

It's too early to calculate since you'll be buying PC in 6 months from now but i could suggest how much each of the components would cost you now for your budget:

Ryzen 5 2400G CPU+GPU (~170€), motherboard (~80€), RAM 16GB DDR4 (~200€), SSD 250GB (~90€), HDD 500GB (~50€), PSU + case (~90€).