The 3600XT is an improved Ryzen 5 3600 / 3600X that features higher clocks for a slight boostThe 3700X is a $3 USD 8core, 16thread midrange Ryzen 3000 series CPU Out of the box, the 3700X, 3600X and 3600 achieve similar quad core speeds but the 16 threaded 3700X is 30% faster at multicore computations than the 12 threaded 3600X The 3600X just doesn't make sense, similar to the 3800X (or any of the recent "XT" chips for that matter) I mean, sure, they're a little tiny bit quicker, but for the difference in price and not to mention thermals, the plain 3600 is the obvious choice
Amd Ryzen 5 3600x Review Gaming Sweet Spot Pc Perspective