It's always easy for software developers to point to new hardware or OS and say "Maybe that's to blame......". The problem is it's often not the hardware or the OS but something a developer altered without noticing when they fixed something else, or added new functionality.
The problem with CA is that every major release that comes out seems to have stability problems and it seems to take 3 or 4 patch releases until the new version is as stable as was the previous version.
My current issue with X7 is when I do an undo with a complex model; CA goes into a 30 minute silence during which it displays a "Building 3D Model, Generating Surfaces" progress box which hangs at about 20%, memory usage soars to 6.3Gb, it then displays a "Not enough memory to complete operation...Close all windows, save all work, exit application........" error, which if I click "OK" it magically completes the operation.
This happens on both machines I tried X7 on. It does not happen in X6. Maybe it's because both machines use Intel 4400 graphics chips, I don't know and I don't care because it doesn't happen on the same machines in X6.
CA shouldn't be using its users to do its QA. When CA puts out a new release it should be at least as stable as the previous release. CA should also add the option to export files compatible with previous versions. At least then I wouldn't be faced with needing to rebuild an entire model in X6 because X7 is not yet production quality.