Memory Voltages

[Rudster8161]

ok ive found a killer deal on some Ram
http://www.newegg.com/Product/Product.aspx?Item=N82E16820211174
all the A-Data ram ive bougt up to now has been awesome, but since i have all most slots used up right now i would have to take 1gb out for a total of 3GB.

my question:

since this ram is a different voltage than my current ram would my current ram have to run at the higher voltage?

how much could i get for my used 4 sticks of ram if i wanted to buy 4 sticks of this stuff?

 

[Lowndsey]

If you use 2 x 1GB and 2 x 512Mb it won't run in dual channel mode

 

[Rudster8161]

it will be 2 separate dual channels so as long as i have 2 sets of the same size (not all 4 have to be) then i can still run dual channel