Hi Sharma, Matt,
I am very curious about this, since I encountered similar problems even at lower bond dimensions ~3000, but with only 64 GB of RAM. Are you using the "WriteDim" functionality for the DMRG? I thought that by using this I would not run into memory issues, as I have 1TB of disk space, but still I got the error ['std::badalloc' what(): std::badalloc] at a given bond dimension depending on the system size, I don't know if you also encountered this problem. Alternatively, if you don't use the "WriteDim" function, are you saying that after solving this bug one can push the bond dimension significantly further?
Thanks a lot!