The game doesn't eat up any more memory than it did before, which should be about 1GB per client, so if you're running out of memory then you should probably be checking for other things running in the background, like browser tabs, before starting up your game clients.
Your biggest bottleneck is likely your video card which only has 1GB on it -- I think 1GB would have been pushing it in Cataclysm after they re-did most of the textures for the old world. Your CPU is going to com after that since it's also old, but any modern day, mid-to-high range system can run five game clients at acceptable settings, and there are numerous threads/posts about performance in the latest expansion in the hardware sub-forum.
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