I'm wondering if there will be a significant speed difference between VPC 6 and VPC 7 on a quicksilver 733 with 768 Mbs RAM. It will be running XP, whether home or pro, I'm not sure. It has to run XP, as the particular program (a farm accounting program) will not run on 98 or 2000. The quicksilver is running OS X.2.8. Anybody have experience with both VPC 6 and 7? Thanks in advance, Jim.