W7 64 bit I could not install the UEFI mode, but no matter. Upgrade with Samsung SSD and 8 GB is indeed tricky, but who has a bit of tact and care works that should hammer out easily. 1 star deduction, due to lack of service doors, otherwise all the top. Working with me was the way the Kingston KAS N3CL / 4G 4GB (1600MHz, PC3-12800 204-pin)