Radeon R7 1700X, is estimated at $ 100 cheaper than Ryzen 7 1800X, it is distinguished by a 200 MHz nominal frequency. Both processors possess free multiplier and support XFR function allowing to simplify the process of acceleration in the automatic mode.
Ryzen processor 1700 for $ 329 with adequate cooling is able to overclock to 4.0 GHz, coming up with a standard Ryzen 1800X operation on performance level . It should be noted that not every motherboard provides the CPU with required power settings, so overclocking success will largely depend on it.
British associates consider that in similar conditions Ryzen 7 1800X processor would be able to overclock to 4.1-4.3 GHz.