Thanks for your prompt answer Edoapra,
Sorry I forgot to specify I was using Nwchem 6.0 with 1 processor only,
I was just confused because the output number 36980521600 had no unity specified (bytes or words) and I did not understand either the meaning of GA.
But thanks to your answer, I realize now I need to ask 35.267 gb to run my ccsd(t) calculation.
Best Regards,
Edrisse