Lenovo thinkbook 14 g4 ryzen 3 July 8, 2019 16 32 64 128 Lenovo thinkbook 14 ryzen Lenovo thinkbook 15 g2 ryzen 3 4300u Lenovo thinkbook ryzen 3 4300u Lenovo thinkbook ryzen 3 Lenovo thinkbook 15 ryzen 3