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The CCSD and CCSD(T) implementation in Turbomole uses multi-pass algorithms
to avoid strictly the need to store any arrays with a size of N3 or
O2N2 or larger as complete array in main memory.
Therefore, the minimum memory requirements are relatively low--although
is difficult to give accurate estimate for them.
On should, however, be aware that, if the amount of memory provided to the
program in the data group $maxcor becomes too small compared to
O2N2/(128×1024) MBytes, loops will be broken in many small batches
at the cost of increased I/O operations and a decrease in performance.
As mentioned above, it is recommended to set $maxcor to 66-77%
of the physical core memory available for the calculation.