Question about ASUS ROG Strix G16

Yes, you can add another SSD to your laptop. Most ROG Strix laptops, including similar models, have two SSD slots that support M.2 NVMe SSDs. You can add a second SSD without replacing the existing one, which provides additional storage space. Note, however, that some models, such as the ROG Strix G16, may have a WLAN module under the second SSD slot, which must be taken into account during installation.