28. How many atoms can HyperChem handle?

In principle, the number of atoms which can be displayed by HyperChem release 5 is 2^(4*8 - 1) or 2147483648 atoms.

HyperChem releases earlier than 4 were "only" able to handle 2^(4*4-1) or 32768 atoms.

To get some idea of the display capacity, we recommend you look at the rhinovirus. In the Samples folder in your HyperChem directory, you have a copy of this Brookhaven file: PDB4RHV.ENT. Read in this file, and merge it several times over. Each rhinovirus PDB file contains 13,333 atoms. We assembled a herd of 5 rhinoviruses (66,697 atoms) before the next Support call came through....

The number of atoms which you can use in a calculation is normally a function of your computer space, and not the limitation of the HyperChem software itself. Please see the Memory Requirements FAQ for more information on this.

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