Lets see if I can describe my problem.

I am running 5 accounts on a single box. i do not have all the stats in my head or here at work but I think I am running the following

4gm ram, 2.4 Hz quad core, 9800 gtx 512mb sli video cards x 2 (linked) that is all I can remember for now.

I get a lot of follow lag(for want of a better term) when going though major cities or loading into a bg. I associate a core to a each wow client and i double up on a core with 2 clients with the hope that this will alleviate follow lag.

Would i see a reduction in city / follow lag if I added a second hard drive and ran 2-3 wow clients on it and 1-2 clients on the main hard dive? I am planning on adding another 4 gb of ram as well to see if it helps.

If you had limited funds would you go a second hard drive?

any thoughts or suggestions welcome.