Just wanted to let people know that I loaded up a large assy with 3 car underbodies. It would not run on a 32 bit machine, even with the 3 Gb switch, so I rebooted into the 64 bit side of mine and loaded it into SW2007 there. Just to get them all to load pushed my Commit Charge to about 4.8 Gb, which is well over the limit for a 32 bit machine. Then I tried a variety of things to see how far I could push, and found that things were pretty stable. A bit slow, but stable. I eventually pushed the Commit Charge over 6 Gb before I gave up and went back to work. My point is that with 64 bit XP, and now the 64 bit version of SW2007, we loaded an assy that we have never been able to do before. This let us look at some comparisons that we couldn't find individually. WT