Don't worry about that list. It's a list of memory tested to be compatible with the board by Gigabyte. It does NOT mean other ram won't work. They will as long as they're the same tech & the bios is set up right.
SS = single sided
DS = double sided
A ram stick may have only 1 side or 2 sides of chips.
CL4 is CAS Latency 4. It's a memory timing. The smaller, the faster & more expensive.http://en.wikipedia.org/wiki/CAS_latency