The only other M.2 slot is the one used for the solid state drive -- which though it has a higher bandwidth allocation than the WLAN card slot, is still subject the rest of the limitations I described earlier.  
Hello everyone. I came across few videos that use PCIE slots to connect with an external graphic card. I am using dell inspiron 15 5000 model 5584. I have an intel cpu i7- 8565u, and an integrated gpu intel uhd 620. And I want to know if I can connect RTX 3060 ti to my laptop by freeing the PCIE slot which is occupied by wifi chip. Your help is appreciated. Thankyou.
Can I connect RTX 3060 Ti to my laptop?