I just picked up a 270c (with the PPC upgrade) and I replaced the cracked screen with the one from my dead 280c. Is it better to run 8.1 or 7.6? I don't require a specific OS on this machine, but which OS will run faster with the PPC chip? ~ Larry, Darn Good Design PS. I have Speed Doubler 8 if this will lean the choice towards 8.1.