You should be able to run at least 5 clients on that machine. I have a lower-specced one and was able to hit 60FPS on my main screen and 30FPS on my alts without taxing the CPU. It usually sat around 60-70% utilization and I only have an older Core 2 Duo 2.4GHz. I do have 3GB of RAM but WoW isn't exactly memory intensive. I'd say try it and as long as your not pouring over into Virtual Memory (HDD Thrasing and massive slowdowns) you'll be fine. Also, there is no reason to install more than 3GB (Recommended) - 3.5GB of Memory in any 32-bit system or for the purpose of running WoW in a 64-bit system. Modern hardware reserves the last 512-1GB or memory for hardware address space and you wont be able to use it. This is a limitation of the 32-bit architecture. Even on 64-bit systems, 32-bit applications only have access to 4GB because of the same limitation. Unless you are running a 64-bit CPU, OS, and your Application is compiled in 64-bit, you will never utilize more memory than 4GB and with the hardware addressing you will rarely see more than 3GB.