Card Reader: Realtek USB 2.0 Card Reader (USB2.0-CRW).WiFi + Bluetooth: Qualcomm Atheros QCNFA344A 5 GHz (Later -> Broadcom BRCM94352Z M.2 5 GHz WiFi + 4.0 Bluetooth).RAM: 16 GB DDR4 (2x 8 GB SAMSUNG 2133 MHz).GPU: NVIDIA GeForce GTX 950M 2 GB (Optimus) & Intel HD Graphics 530.CPU: Intel Core i5-6300HQ 2.3 GHz (Skylake).(Note: mine is 55TU version, but the bootpack will work fine with another versions of 591G, for example: V5-591G-71K2, -764Z, -59PU, etc.) (Sierra, High Sierra and Mojave needs 'SATA-100-series-unsupported.kext' and unmodified 'AirPortBrcmFixup.kext')