Filling every PCIe lane
Filling every PCIe lane
You're checking if it's possible to install an additional M.2 SSD in the second slot for Steam games on your B650M Aorus motherboard. Based on the available lanes and your setup, you have 4 remaining slots after accounting for GPU, SSD, and chipset usage. The block diagram suggests there are enough lanes left to add another SSD without affecting GPU performance. So yes, it's likely correct—you could add it.
That port isn't connected to any other port, which means it won't affect your GPU's performance.