Bought a used unit that was in new condition. Spent quite a bit of time trying to install Windows 7 but finally got it up and running. Found I had to install Window 8.1 first so I could used the Intel program that adds the USB3 drivers to the Win7 ISO file. Then installing Win7 from a USB drive went forward. If you want to run Win7 read the instructions at least twice before proceeding. Fan noise is noticeable when it is running but is not terrible. Having only 4 USB ports (all version 3) is more limiting that expected. Graphics is good but am not doing any gaming that will push the GPU. The Intel driver update program shows me 3 items to update but have not been able to get them to work so am running the 'old' drivers but it seems OK. Installed Linux Mint 18.2 with ease , it runs like they were made for each other. Have 2 of Crucial 275GB M300 SSD's that allow for dual booting , one for Windows and one for Linux Mint. Maxed the memory at 32GB (Crucial part number: CT9159266) . Windows performance score ... processor 7.7 | memory 7.9 | graphics 7.5 | gaming graphics 7.5 | primary hard disk 7.9