Don't know about WoW and lag due to hard drives, since Everquest is mostly zoned and HDD load times really only happens when zoning, so is a difference of waiting 1 second, maybe 2, when zoning on a comparable build with a 7200 rpm 720gb+ to velociraptors. I have however looked into faster HDD's for flight sim x , which is very graphically intensive with lots of stuff to load and you'd think faster HDD's would make a difference, but it does not. At least comparing the 7200 rpm 720gb+ hdds to velociraptors and even SSD's. What makes a difference is CPU, memory and GPU. Look at your HDD light when you play, is it always on? What's your cpu load when you play or memory use? If you are using a newer 7200RPM drive with big platters and you lag, the bottle neck is probably not going to be the hard drive and spending huge $$ for velociraptors or SSD's is just going to empty your pocket of $$ with very little gain. SSD's are very useful for some applications, gaming is not one of them, unless you do a ton of loading times. Once actually in game, it does not matter. Velociraptors....for the $$ and the actual gain compared to new 7200RPM drives, I don't understand why anyone buys those.