The flagship offer is the Ryzen 5-1600X, a 6-core/12-thread SKU with 16MB of L3 cache, working at 3.6GHz base and 4.0GHz Turbo clock as well as the XFR technology, which should boost the overclocking capability depending on the CPU cooling. The same goes for the Ryzen 5 1600 SKU, which lacks XFR feature and works at slightly lower 3.2GHz base and 3.6GHz Turbo clocks.
The flagship 4-core/8-thread SKU is the Ryzen 5 1500X, featuring 8MB of L3 cache and working at 3.5GHz base and 3.7GHz Turbo clocks. This one also features the XFR technology and should provide decent competition to Intel's Core i3 and mainstream Core i5 CPUs. The Ryzen 5 1400, lacks XFR and works at 3.2GHz base and 3.4GHz Turbo clocks, and should be the workhorse of the current lineup and the cheapest option for those wanting to get on the Ryzen train, at least so far.