If you can spend an extra 20 euros though I'd go for this memory instead.

8GB 3000 dual channel ddr4 2x4GB sticks...

No problem google translator works haha. You can overclock that cpu as well with that setup. Here's a review of the processor so you can compare to Intel if you are curious.
...

Alright. Here's my recommendation for you.

255 for amd ryzen 1600
http://www.e-shop.gr/cpu-amd-ryzen-5-1600-360ghz-6-core-with-wraith-spire-box-p-PER.559703

79 8GB 2666 dual channel ddr4 2x4GB...

Sunflower, what site do you plan to buy this from?

Uh no. He said i5 7500 which is a kaby lake and that is 7th gen. Click his link. Says it supports 7th and 6th gen. Unless you know better than gigabyte.

That's not true. Same socket, just a bios update is needed for most motherboards.

I'd recommend you go for an AMD ryzen 1600x or an Intel i5 7600k. Depends if you value higher core count or clock speed. Then go from there. Although the AMD would probably do you better in the long...

If I were you, the 3 parts you should be looking to upgrade are going to be your cpu, ram and mobo. A C2D is really dated at this point. Im not sure what the prices in EU are right now though.

List your current system specs and I think you will get better advice. Include the monitor.