Minimum System Requirements
Requires 64-bit processor and operating system
Operating System: Windows 10 (64-bit)
Processor: Intel Core i3-560 / AMD Phenom II X4 805
Memory: 4 GB RAM
Graphics: AMD Radeon R7 360X / NVIDIA GeForce GT 730
VRAM: 2 GB VRAM
DirectX: Version 11
Storage: 40 GB + available space
Sound Card: DirectX compatible
Recommended System Requirements
Requires 64-bit processor and operating system
Operating System: Windows 10 (64-bit)
Processor: Intel Core i5-4670K / AMD FX-8370
Memory: 8 GB RAM
Graphics: AMD Radeon RX 580 / NVIDIA GeForce GTX 1060
VRAM: 4 GB VRAM
DirectX: Version 11
Storage: 40 GB + available space
Sound Card: DirectX compatible
I think we will see geforce gt 730 as the minimum system requirement for age of empires 4 because considering that the game is made on the same engine as age of empires 3 and the aoe3 system requirement is gt 430, it makes sense that the aoe4 minimum system requirement is gt 730.