Summary: The difference is night and day in performance. Games that didn't run well with the gtx 260 in the M15X it was installed on, runs flawless. Brought the WEI to a 7.2. The i3 has a TDP of 35w and this one is 45w, but I used Arctic Silver 5 on both the GPU and CPU, making it run just as cool as before. You might see a slight decrease in battery life, but who cares!!