How do I check if my laptop has a m.2 slot for ssd?
If it has a notch on the right side, this laptop would support the M.2 NVMe as well as the M.2 SATA SSD. If the notch is on the left side, it is an M.2 SATA-only port.
Does the laptop have an extra slot for SSD/HDD and RAM?
The M.2 connectors might be different but an NVMe port would support the M.2 SATA SSD physically. However, whether the system supports the SATA drive or not will depend solely on how the motherboard is designed.
Can I Use a PCIe 4.0 NVMe SSD in a PCIe 3.0 Motherboard Slot?
An NVMe slot is a specialized M.2 connector on a motherboard that allows you to install high-speed NVMe SSDs. Recognizing an NVMe slot is straightforward if you look for the M.2 label and check the motherboard’s specifications.
PCI Express - Wikipedia
M.2 To PCIe Adapter / 2.5-inch U.2 NVMe drive to PCI Express x16 Slot card or SATA III SSD/HDD PCI Mount – SY-MRA25060. ...