Let’s address the elephant in the room. If you search Lenovo’s support website for "IS7XM," you will hit a dead end. Lenovo does not provide a direct PDF download for this board under that model number. This is because the board is a of a larger system.
This board has only SATA II (3Gbps) . An SSD will still be faster than a hard drive (since SATA II caps at ~280 MB/s vs HDD at ~120 MB/s), but you won't see the full speed of a modern SATA III SSD (which does 550+ MB/s). Do not buy an NVMe drive—there is no M.2 slot. lenovo is7xm rev 10 motherboard manual