Your system doesn't take anything special. Not EDO or Registered or any other fancy term.
To see what you have now you'll probably have to take the cover off (while system is off) and pull the RAM stick out and see what it is.
Found this description of "Double Sided":
"Double-Sided Memory refers to how the module is physically built with the individual memory chips. In this instance, they are placed on both sides of the PCB. (However, some people may use this term to describe the logical electrical organization of the DIMM. In that case, you should refer to Single-Bank and Dual-Bank.)"
And this is the description of "Dual-Bank":
"Dual-Bank is a way to describe the logical electrical organization of the DIMM rather than single-sided memory or double-sided memory. (For example, a 256MB DIMM built with 16Mx16 components may appear physically as a single-sided DIMM, however the logical electrical organization of the DIMM is dual bank.)"
I wouldn't worry to much about that.