Geometry Optimisation with CASTEP

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A Variable Cell calculation for Bulk Silicon.
In our bulk Silicon calculation we had a rigid supercell shape and the starting atomic positions of the silicon atoms
were those known to be correct. What effect will a variable cell calculation have?
In the cell file
FIX_ALL_CELL : FALSE
In the .param file our keywords are;
finite_basis_corr : 2
which ensures that an automatic finite basis set correction is made
The complete output is in the link. We see that the first three steps are indeed singlepoint energy calculations
Calculating finite basis set correction with 3 cut-off energies.
Calculating total energy with cut-off of 270.000eV.
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