Lenovo ideapad slim 3 i7 13th gen launch date specs July 8, 2019 16 32 64 128 Lenovo ideapad slim 3 i7 13th gen specs Lenovo slim 7 carbon 13iap7 Lenovo ideapad 3 17iau7 review Lenovo ideapad slim 3i 14 Lenovo ideapad 3 15iau7 ram upgrade