Which facility?
  The W91 main campus facility is suited to housing lower power density installations that have requirements for physical proximity to main campus.

  The Bates, Middleton facility is designed to house moderate power density equipment.

  The MGHPCC, Holyoke facility is designed to house higher power density equipment.

All the facilities are accessible through dedicated high-speed network links. An overview of each location is given below.

MIT maintains three shared locations that are available Institute wide and in which rack space can be rented to house research computing hardware - W91 on main campus; Bates in Middleton, MA; the Massachusetts Green High Performance Computing Center (MGHPCC) in Holyoke, MA.
All three facilities provide purpose built locations for power intensive computing infrastructure. The Bates and MGHPCC facilities employ containment systems for handling exhaust heat. This increases their efficiency and helps lower overall MIT energy and emissions footprint.

Summary of the facilities

Bates Laboratory, Middleton, MA

The Bates computer center is an MIT owned and operated location in Middleton, Mass. It has a total of 70 racks that it rents out to HPC customers. The facility can support 700KW in computer load and is connected back to main campus via a 10 gigabit ethernet private network link that supports 18. subnets on machines at Bates. The site is about 45 minutes drive from Cambridge.

Details on requesting space at Bates can be found here.

Massachusetts Green High Performance Computing Center (MGHPCC), Holyoke, MA

The Massachusetts Green High Performance Computing Center (MGHPCC) is a joint Boston University, Harvard, M.I.T, Northeastern and UMass building in Holyoke, MA. MIT has a pre-allocated set of 68 racks at the facility that can be rented for computer use. The facility can support 950KW in computer load in this space, with additional racks available if circumstances support that. MGHPCC connects to the main campus via a dedicated 10 gigabit ethernet link and is about two hours drive from Cambridge.

Details on requesting space at MGHPCC can be found here.

MIT Building W91, Cambridge, MA

The W91 building is on the main MIT campus about 10 minutes walk from the MIT dome. It can accommodate about 40 racks and about 240KW load.

Details on renting space in W91 can be found here.