Soldato
as title says and for the board in my sig.
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I think I'm right in saying your current CPU is a dual core, so yeah bumping up to an 8 core should help massively. Note you will need a GPU as Ryzen has no onboard graphics whatsoever.
I would normally say it would help to know what sort of thing you use that PC for. However your current CPU is so low end I think you would notice the difference everywhere, even web browsing. I would suggest another stick of the same ram at the same time to let those extra cores breathe a bit. Or even better a couple of sticks of 3200 ram.
Just to give an idea, you are looking at over 10x the performance for multi-threaded work which would be an incredible upgrade for the price 1700's sell at 2nd hand.