Actually not all games use 100% of the CPU, some are GPU-intensive or neither hardware intensive. But the CPU-intensive ones you theorically should get 30% the full speed with 30% clock. Anyways, changing the virtual CPU clock may break the game in some cases.
PC: AMD Ryzen 5 3600 / GTX 660 2GB / 16GB DDR4 3600MHz / Windows 10 Pro
Phones: Poco F3 8/256GB (Snapdragon 870 5G) and Redmi Note 6 Pro 4/64GB (Snapdragon 636)
Phones: Poco F3 8/256GB (Snapdragon 870 5G) and Redmi Note 6 Pro 4/64GB (Snapdragon 636)