Early 2011 13″ Macbook Pro – Macbook 8.1 according to wikipedia (so it is maxed at High Sierra).

Procesor: I5-2415 (2.3Ghz) w/ onboard HD3000 graphics
Ram: 16GB (2x8GB sticks) of PC3-10600…

FS/FT: Early 2011 Macbook Pro 13, Intel NUC i5 in a passive case, more

Source: [H]ardOCP – FS/FT: Early 2011 Macbook Pro 13, Intel NUC i5 in a passive case, more