ok i bought me system about 2 years ago now and i have 2x2g setup. Muskin 7-7-7-20 at 1.85v
 
I was thinking about getting another 2x2gb problem is muskin doesnt make any 7-7-7-20s anymore. patroit does have one but at 1.7V
 
so how should i go about getting a pair of memory without tossing my system to out of wack. they dont make memory with that high of voltages anymore. if i bring the voltages doen to match my new pair will that make my old pair unstable? or should o bring my new memory up to 1.85z, but doesnt thing run a risk of damaging it?

so your saying if i get more memory i need to make sure it has just as high as voltage as what i currently have.