Your system is comparable to mine, and I very rarely have any trouble with lag. I usually have all my wow clients running along with Firefox, Vent, and iTunes. I run 5 toons on 1 PC, but I run my 'driver' toon from one wow directory, and the 4 alts from a separate wow directory. (I am not using the symbolic links, though.) So I have a total of 2 different wow directories - for the different video settings. On the driver toon I have all settings maxed and set the maxfps to 50. On the alts I have the maxfpsbk set to 15, and all the video settings turned way down, especially the terrain distance. I have sound turned on for all clients. I have a WD Raptor 10k rpm drive that I run my wow clients from.