Thought it would be interesting to share this tidbit. Please add your own 
Machine is a 13" Macbook Pro (2020, 2.0 Ghz Intel i5 CPU)
Geekbench 5 CPU benchmark:
Regular run:
Single core: 1240
Multi core: 4443
Low-Power Mode (on battery):
Single core: 820
Multi core: 3447
Seems like the base clock of 2.0 is (mostly) enforced. Screen refresh rate remains at 60 Hz.
Machine is a 13" Macbook Pro (2020, 2.0 Ghz Intel i5 CPU)
Geekbench 5 CPU benchmark:
Regular run:
Single core: 1240
Multi core: 4443
Low-Power Mode (on battery):
Single core: 820
Multi core: 3447
Seems like the base clock of 2.0 is (mostly) enforced. Screen refresh rate remains at 60 Hz.