Dear Friends: 64 bit Gaussian 09 software for windows is more expensive than 32-bit Gaussian 09. In our work, we deal with coordination compounds with about 50 atoms. So, can we use 32-bit multiprocessor G09 in our calculations without any problem and with reliable calculation time or we must purchase 64-bit G09.
Best, Adnan
Amit K. Harit
In my experience, TD-DFT based calculation for compound having around 30-35 atoms take almost same time in G09 (32 bit or 64 bit version; 8 Gb RAM, 1TB). Although, if you upgrade your system with better machine then definitely calculation time will decrease. Importantly, with upgraded software you will get some additional basis set which are required in some cases.
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