Here are the Crusader Kings 3 Legends of the Dead System Requirements (Minimum)
CPU: Intel® iCore™ i5-750 or Intel® iCore™ i3-2120, or AMD® Phenom™ II X6 1055T
RAM: 4 GB
VIDEO CARD: Nvidia® GeForce™ GTX 460, or AMD® Radeon™ R7 260X or AMD® Radeon™ HD 6970, or Intel® Iris Pro™ 580
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows® 8.1 64 bit or Windows® 10 Home 64 bit
Crusader Kings 3 Legends of the Dead Recommended Requirements
CPU: Intel® iCore™ i5- 4670K or AMD® Ryzen™ 5 2400G
RAM: 8 GB
VIDEO CARD: Nvidia® GeForce™ GTX 1650
DEDICATED VIDEO RAM: 4096 MB
PIXEL SHADER: 5.1
VERTEX SHADER: 5.1
OS: Windows® 10 Home 64 bit