About to start my first game jam. Any tips?

My grandmother recently died and me and my brother were wondering what was to happen to her 10+ year PC (Dell optiplex 760). I could find a use for the monitor and my brother wanted to use it as a server. We asked around at the family and everyone seemed ok with that except for one guy..

Apparently the PC is still in "prime condition" running Windows 7 after an upgrade from Vista. It has 'a graphics chip or something like that' and is better than any laptop on the market right now. (I actually had my HP zBook 15 g3 with me). He claimed it wasn't some old worthless piece of junk and most family members would probably be interested in this machine.

I didn't try to argue because I realized he was not at all knowledgeable about technology and I didn't want to be disrespectful.