I'm looking at a Dell workstation wst7400 that has a single Xeon E5405 2.00 ghz I'm thinking about adding a second. I imagine the second has to match the first one. This system has 32 bit vista ultimate will it run 2 quad core cpu's? I't has 4GB of ram should I up the ram? I primary want to use this for 3D/CAD INVENTOR 2013. The price is around $550... Let me know if this is worth the money???