AMD benchmarks Cinebench on Threadripper 1920X and Threadripper 1950X. Compares it with the Intel Core i9-7900X. The 1920X scores 2431, the 1950X does 3062 and the Intel Core i9-7900X delivers a score of 2167. So 1950X beats 7900X by about 41 percent in this test.
More details about Threadripper processors as well as the entire Vega video card line wil be revealed at SIGGRAPH.