My GF bought the Acer V3-771G-53216G50BDCaii 17.3'' Laptop 18 months ago.
Specs:
i5 3210M @2.5GHz Turbo Boost 3.1GHz
4 GB RAM
Nvidia GT 630M
17''
So a few months ago it started lagging up in all the games she tried to play, after only a few minutes in.
We checked everything and HWinfo showed...