How many cores does Materials studio support?

Hi, I am negotiating with a National Supercomputing Center to rent their computers to do CASTEP and Dmol3 calculation. They can offer us up to 1024 cores but they said that from past experience the best performance of Materials Studio may be obtained by using no more than 64 cores. I was wondering how many cores does Materials Studios support? And how many cores would lead to the best performance?

Thank you.