The National Nanotechnology Infrastructure Network’s computational drive (NNIN/C) at Harvard University includes the following Hardware facilities.  

NNIN users currently have access to the SEAS Cluster, comprised of: 45 dual 32-bit Xeon blades (2.4, 2.8 and 3 GHz) each with 2.5 GB of RAM with gigabit ethernet interconnects; 4 IBM P655 nodes with a total of 20 Power4+ processors running at 1.45GHz, totalling 64 GB RAM; and 3 units of 4-way  Opterons from SUN Microsystems, totalling of 80 GB RAM.        

Further details can be found at http://www.cns.fas.harvard.edu/nnin/nnin_computation.php . However, some information there is outdated. Please check and make sure it works.   

Using the NNIN/C computer resources requires password-less SSH access to nnininn.seas.harvard.edu.

You can use the server "login.seas.harvard.edu" to setup ssh key authentication following the instruction here: https://community.crimsongrid.harvard.edu/getting-started/setting-up-ssh-access-to-hpc-hosts

If you set up SSH key pair on login.seas.harvard.edu or other Linux OS or Cygwin, you can login with password to login.seas.harvard.edu, then connect to nnininn.seas.harvard.edu , or you connect directly from under Linux OS and Cygwin through command "ssh -i .ssh/keyname username@nnininn.seas.harvard.edu"

It is also possible to set up SSH key pair from under Windows OS, please check https://community.crimsongrid.harvard.edu/getting-started/setting-up-ssh-access-to-hpc-hosts or contact mschelp@psu.edu for further information.