How much is this computer worth in euro's?

(I've inserted a picture with the specs)If you were buying this system used I'd say try to get it for around $300 USD or less which is 262.96 Euro's or less.

Pros going for this system is that it has 16GB RAM, GTX 960 Video Card, and a Large SSD.

Cons going for it is that the CPU is general level gaming and some titles out there require FX-8350 or BETTER as minimum requirement although this system could probably run the games with some lag for CPU INTENSIVE games.

If your looking to sell this system you might find it easier to get your money BACK out of it by parting it out online for PEOPLE to bid on at ebay etc vs selling a complete used system. And unless there is a heavy demand for a specific used part your lucky if you get 40-50% retail new price when selling used for parts. If there is an abundance of the parts used your lucky to then get 25 to 30% what you paid as well as as components age and demand is reduced for them you see used parts going for 10% to 20% of cost new. But these percentages also don't apply to a rock bottom value in parts, so such as a power supply can hit a rock bottom of around $12.50 used worth for a $50 power supply for example vs $5.00.

For Christmas I upgraded my gaming system to 16GB DDR3 1600Mhz for $72, the SSD market prices are tanking lower and lower and there are better video cards out there than the GTX 960 and Sapphire brand is not as in demand as a EVGA brand card etc.

If you were planning on selling this and buying something better, you might be able to keep this system and just put in an 8-core CPU instead of the 6-core and that might get you where you want to be with performance. I own a FX-8300 3.3Ghz and a FX-8350 4.0Ghz system. I prefer to use my 95 watt TDP FX-8300 8-core for most of what I do instead of the FX-8350 4.0Ghz only because the air cooled heatsink that comes stock with the CPU from AMD is barely adequate for the heat that the 125 watt TDP CPU creates, so the CPU is always running at 100% speed to cool the FX-8350 at 4.0Ghz and this makes it annoyingly loud running, so liquid cooling is suggested if you went the upgrade route to 8-core and with the FX-8350 4.0Ghz... Also to note the FX processors most of them have Turbo feature that clocks the CPU's faster such as the 4.0Ghz FX-8350 can Turbo to 4.2Ghz, however my motherboard does not support the Turbo feature and so the cheap Biostar motherboard only runs at 4Ghz maximum. Your board is a gaming board and it might support the Turbo feature to slightly overclock the CPU on the fly with Turbo enabled. The FX-8300 I have seen go for $100 USD new and $60 used, and the FX-8350 go for $120 USD new and $80 used.
Thank you for replying.

I actually wanted to buy this computer to play fortnite and it's really cheap! He's selling it for 175 euro's, got a bit lucky i guess. and do you think i can play pubg on medium or even high without lag? And again thank you for taking your time to reply to me and do research, i really appreciate it!If you currently don't have a PC then SURE, go ahead and buy it.

You should be able to run Fortnite fairly well, PUBG however is less well optimised, meaning basically it is more intensive than it necessarily needs to be. Some systems can struggle a lot with PUBG but the GPU should be fine for low settings. As well as you have plenty of RAM, which is great, despite the slightly low clock speed.

If you have the money spare and don't currently have a PC you can play games on, I would go for it. Try t0 get it for 230 -260 euros