One is the Partners Help Desk
The other is the DFCI Research Computing Support Request Service

But how do you know which to use?

The Partners help desk is, first of all, for services provided by Partners, e.g. problems with H: drives, problems with email, access to clinical information, etc.
In addition, if you are a researcher and you have a piece of equipment that we take care of (e.g. a Mac, non-standard PC, or a computer associated with a piece of lab equipment) a call to the Partners Help Desk will get the request added to a Help Service Queue, and a technician from our group will be dispatched. You can use the web site link above or call the HelpDesk at 632-3399

But if you require a new service, a new share, or if you want help setting up a server, managing a server, help with purchase of equipment, or, in a general way, something that isn't actually broken, then please use our Support Request site. Don't worry if you get to the wrong site. We'll get the request to the right place anyway.