As Vista looms, we need to start testing our software on the OS. I want to do this in virtual machines (MS Virtual PS, Virtual Box, VMWare), but I have very specific requirements. All of the virtual PCs that I have tried will allow you to change system RAM, video ram and HDD space, but not processor speed. I need to test the ability of Vista to run on different processors and the impact of perfomance on the applications.
Does this type of software currently exist? What are my options. Has anyone else done something similar?