4-Layer PCB designed Built-in SFF-8643 female connector Built-in PCI-e Gen 3 x4 slot connector SFF-8643 mini SAS HD pin out defined by PCle PCI Express Base Specification Rev 3.0 PCI Express Card Electro-Mechanical* (CEM) Specification Rev 2.0 NVM Express* 1.2 a PWM synchronous buck converter Power IC? 3.3V, 4A maximum output current? Short circuit protection? In-rush current suppression? Thermal shutdown protection? ESD HBM (Human Body Mode) /2KV? ESD CDM (Charged Device Model) /500V