2GB Max for VPC 7, speed good though ;-)
I received my Virtual PC 7 yesterday and promptly installed it on my 1st gen dual 2GHz G5. It locked up my system over and over every time I tried to launch it. Hard lock-ups, at that, kernel panic greyed out screen. I figured it was because I originally installed VPC 6 1 year ago, not knowing it wouldn't work. So I scoured my system getting it all completely uninstalled. Then re-installed VPC 7 and it still crashed, but didn't lock up the system. Eventually it started working, but not reliably. At that point, I had already a call in to MS, which was inundated with calls about VPC 7. They called me back about an hour later and said, "How much memory do you have in your system?" I HAD 2.5GB. MS said they have an issue with machines over 2GB, so I yanked out 512MB and it's been fine since. Pretty speedy, but no SMP support. Since it's emulating a single CPU system, it won't try executing any instructions in parallel. I'd love to see how fast it'd run if it emulated a dual CPU system. I am bummed they didn't include the native graphics card support, but overall, I'm happy. One other note, full screen mode on multi display systems seems to have an issue when the app loses focus off to another display. The VPC hangs when it regains focus until you resize or it loses focus again and focus returns.