I am using MSI afterburner, and I overclocked as I said a top topic. That clock is stable all of the game without drop a FPS. I also tested stress a GPU, it was 85~92'C for 20Min. I know it is avoid warranty if you overclock a GPU. However, in my case, I d used G60vx laptop before, and I overclocked Gtx260M as core 500>550 Mem 1200 > 1350 for 2years. It was working just fine since I overclocked GPU. So my opinion is 10~13% overclocking is fine to push and power adapter is capable of doing it.