8800gt Voltage

[lilmanmgf]

I bought a galaxy 8800gt from ncix, and I ended up getting stuck with the hairdryer version. They worked with me and I ended up getting an accelero S1 with the turbo module at cost. With the voltage jumper in the default position it supplys 1.25 volts(or so I have been told). In this setting I cant get past 700 on the core or 925 on the memory. When I move the jumper I get 1.35 volts(once again this is what I have been told) and was able to run ati tool artifact finder for 1 hour without any problems: 750core 1000mem. At this voltage the core is 40idle and fluctuates between 48 and 50 full load. I know the temps are great, but will the increased voltage kill my chip much faster? I've heard stories of the memory controler being destroyed at increased voltages.