It has a somewhat medium -lowish gpu but I am planning on upgrade anyways the question is can it run crysis 3 on medium or ultra with my low res 1366x768 (Thats my native res btw)
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You can play it on medium-ish at 1366x768.
if it is a i5 or i7 it is already ocing look into a Intel(R) Turbo Boost Technology Monitor 3.9 GHz with Turbo Boost and update your video drivers too they do not update on there own. Even on auto update.