You can go over 1.65v on your memory with no ill effects. You just have to make sure your DIMM/QPI voltage stays within .5v of your DRAM voltage. This is easily done and it won't hurt the life expectancy.
As for wanting the ram to last 10 years, even if you ran the memory underclocked and under volts it still may die prematurely. There is no way to guarantee 10 years of use.
Originally Posted by uneeb83
I love the corshair kit but the 1.5 volt kingston kit tends to offer a longer life
That statement is false. Just because it's rated for 1.5v doesn't mean it's going to last longer. Personally I've owned memory from numerous manufacturers and OCZ has been the most reliable. Actually, of all the memory I have owned, Corsair always seems to die sooner rather than later. And Kingston, while once a major memory brand, just hasn't kept up. Kingston would be one of my last choices.
As for running 1600MHz memory at 1333 at 1.5volts, any 1600MHz memory can run at 1333MHz while the exact voltage needed will have to be tested. But I would think 1.5v would be about right. However running it at 1333MHz won't guarantee a longer life, but it will guarantee slower performance.