I just tested this with the RandomX benchmark v1.0.4 (Win64) because I am thinking about picking up a Ryzen 3000 CPU. I only spent about 10 mins with it but was shocked how bad the TR4 platform performed (all tests were with LargePages enabled):
Ryzen 7 1700 @3.9 (3200 DDR): 5030 h/s (8 threads)
Ryzen 7 1700 @3.9 (3200 DDR): 4000 h/s (10 threads)
Ryzen 5 ...
I haven't seen any results for your specific CPU yet, but looking at a somewhat outdated thread (the algorithm and benchmark tool have had minor changes since), and the details on the project README for other Ryzen processors, I would guess at a minimum yours will achieve 5Kh/s.
It's really not possible to compare to what "high end GPUs" will achieve ...
RandomX is designed to run efficiently on general purpose hardware, e.g. CPUs and to some extent, GPUs.
Quoting the project README:
RandomX is a proof-of-work (PoW) algorithm that is optimized for general-purpose CPUs. RandomX uses random code execution (hence the name) together with several memory-hard techniques to minimize the efficiency advantage of ...
It should be possible, but whether your miner supports it is another question.
I'll also point out there has been lots of people very sceptical of minergate. Just search Reddit and draw your own conclusions.
My recommendation is to use either xmrig or xmr-stack and one of the pools the community deem as honest.