My system is very similar to yours except I now have a video card that I added and it still doesn't help alot.

They way your onboard video more than likely works since you have the radeon xpress 200 is with dynamic memory.
which is explained here http://h10025.www1.hp.com/ewfrf/wc/f...cname=bph04502
just scroll down about a screen and you will see. It works very well for onboard but not with the stress multiple WoWs creates on the system.

Same chipset on the mobo, amount of ram and processor etc. And Im only running 2 WoWs on my system. You would be better off to upgrade as I am going to have to as well for more than 2.

I see processor usage between 60% and 100% even with using the maxfpsbk and pagefile usage a little over 1gb

The addition of a video card will improve your framerate a bit but town will still be hell.

So with that in mind you can see where the bottleneck lies. Processor, memory, and possibly hard drive being a lil overworked.

My ideal setup for anymore than 2 WoWs will definitly be with a dual or quad core processor, 2gb+ ram, and I think 1 hard drive per WoW (or some sort of raid setup?) will help immensely with load times

Good luck to you and if you find a fairly cheap solution to add just a third to run decently please let me know