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I read on the internet that there are RAM with different ammount of chips on a single stick . Eg, 128MB (4 chips) . 128 MB (8chips) . What are the number of chips supposed to mean ?

Not much... not much at all. The number of chips depends on how much each chip holds, and how much total memory is on the stick.

not really, w/ chips on both sides the ram is single density, with the chips on one side it double density, dont know if there is a performance issue between the two, but if i were to bet, i would say single density's better.

Single or low density is more compatible with motherboards. Double or high density offers better performance, but is slightly less compatible. I would recommend double/high density, just make sure you check the specs on your motherboard to make sure it supports the make and model of RAM you want to buy. Here is a list of RAM makes and models that will work with Intel DDR motherboards.

http://www.intel.com/technology/memory/ ... esults.htm

single density ram is double sided ram
and
double density ram is single sided ram

carrect?

Single/Low Density RAM is single sided. Double/High Density RAM is double sided. It's easy, just put the two terms together: Single Density = single sided; Double Density = double sided.