But that's a ryzen 1600. Should i buy the 1600x or 1600 ?
I know it was a 1600. But they are the same CPU with the 1600X being sold at a slightly higher clock speed. Both should be able to run all 6 cores at 3.9HGz - 4GHz with little effort. And you get a decent stock cooler with the 1600. No cooler with the 1600X. Your choice.
Most folks would probably opt for the 1600 and put the savings toward a gfx card. But only you can decide depending on the price difference when you buy. Right now, there's about a $30 price difference between the two.