I overclocked my gpu core from 950 mhz to 1050 then ran 3d mark vantage and uniheaven benchmarks a few times and my max temp where 78c is that fine or not ? And is my warranty now gone on the gpu ? And does is shorten the life of the card ? I'm running is stock now don't see any need for the overclock or will I see beter fps with that little oc ? Thanks