Here are the official PC system requirements for Cities: Skylines 2

MINIMUM:

Requires a 64-bit processor and operating system
OS: Windows® 10 Home 64 Bit
Processor: Intel® Core™ i7-4790K / AMD® Ryzen™ 5 1600X
Memory: 8 GB RAM
Graphics: Nvidia® GeForce™ GTX 780 (3GB) or AMD® Radeon™ RX 470 (4GB)
Sound Card: TBC

RECOMMENDED:

Requires a 64-bit processor and operating system
OS: Windows® 10 Home 64 Bit | Windows® 11
Processor: Intel® Core™ i7-9700K | AMD® Ryzen™ 5 5600X
Memory: 16 GB RAM
Graphics: Nvidia® GeForce™ RTX 2080 Ti (11GB) | AMD® Radeon™ RX 6800 XT (16GB)
Sound Card: TBC