The Geekbench 4 scores show the base model 2019 with a quad-core 1.4GHz Core i5 processor of the 8th generation, with a single-core performance increase of 6.8% and a 83.4% increase in multi-core performance, compared to the base 2017 model with a 2nd generation Core i5 dual-core processor 2.3 GHz.
Specifically, the 2019 model has single-core and multicore average scores of 4,639 and 16,665 respectively, based on eight Geekbench results, while the 2017 model has an average of 4,341 for a kernel and 9,084 for a multicore network.
The new entry-level 13-inch MacBook Pro uses the Intel Core i5-8257U processor, which appears to be a custom variant of its Core i5-8250U processor designed for Apple. The 15W chip is part of the Coffee Lake family and has a maximum Turbo Boost frequency of up to 3.9 GHz.
The notebook can also be upgraded to a 1.7GHz quad-core Core i7 processor of the 8th generation. This configuration uses the Intel Core i7-8557U processor, which is also considered a custom variant of its Core i7-8550U processor, with a TDP of 15W and a maximum Turbo Boost frequency of up to 4.5 GHz.
So far, only one Geekbench result is available for the 1.7 GHz configuration, with hearts and hearts scores of 4,835 and 15,515 respectively. There is room for variance here as more results come in, but that would represent a performance increase of about 60% over the 2017 equivalent model.
Apple announces new entry-level 13-inch Macbook Pro as "twice as powerful" as the previous generation. Benchmarks approach this threshold at 83%, but real-world performance will vary.
Apple has not updated the 13-inch entry-level Macbook Pro in 2018, this is why the 2017 models serve as comparisons with previous generations.