Well, for starters, I just bought that same kit less than a month ago and have been using a 1gb stick since Oct. (3gb total now) and they've been running great at 2.2V
I'm thinking that the reason the voltage rating changed wasn't because the sticks kept dying but because the newer models have been made of less quality to be able to offer them for a HUGE discount. A 2gb kit was $300 in Oct...now the prices are 1/3 of that!
I wouldn't suggest you up the voltage past 2.2V just because you don't need to. Maybe later on once you're willing to lose them push them to the limit or something but just be safe for now just in case. Like the other guy said, you should be able to OC these like crazy even without the high voltage and Core 2 Duo chips hardly benefit from low timings anyways.
Originally Posted by spartan1121
Don't you void your warranty when you overclock?
I'm pretty sure G.Skill's warrenty would cover that, afterall they pride themselves as the best overclocking RAM. Their "100% Lifetime warrenty" may be limited but it doesn't say it.