Who does not know the problem that Creo/Proe sometimes just doesn't open up a big assembly,
just freezes and the hard work of several hours goes to the Assembly/part/drawing heaven.
That Problem may occur if you have a 32bit System. It does not matter how much RAM you have got.
Either 2-4-8 or 16gb of Ram, it doesn't matter! A 32bit System is able to use around 1.8Gb of RAM per program e.g creo/proe.
If you have a big assembly for example and you need more RAM you can make a 3GB switch (It increases the amount of RAM usage per Program) That instructions are for Win7 32Bit:
start->cmd
click with the right mouse button on cmd and hit "Run as Administrator"
Type in bcdedit /set IncreaseUserVa 2700
DONE
Now Creo/ProE is able to use about 2700 mb RAM for a single application.
To undo that option:
bcdedit /deletevalue IncreaseUserVa
ATTENTION!
Please be careful with this option. If you take the whole 3GB for example it happens that the PC can't boot!
I'm not responsible! I'm the guy who gives the tips.
If you need instruction for Win XP 32Bit you can always contact me or write a comment.
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With engineered regards