Question: what is the difference between m.2 and ultra m.2?
Answer: 2 connector, but also the so-called Ultra M. ... By contrast, the Ultra M. 2 slot relies on PCI Express 3.0 x4 interconnection and thus boasts up to whopping ~4GB/s, two times higher compared to PCIe x4 and four times higher compared to PCIe x2 connection. The Ultra M.