With just WoW and Vent open my ram usage has been going over 90% and dramatically dropping my fps to where I can sometimes close wow and it'll go back down but other times I have to completely restart my computer. It started maybe a week or two ago I'm not sure if it was before or after I installed SP1 for W7. Used to be able to run several open browsers in firefox, have music playing, vent open, and run WoW with no problems.