Wikipedia's Xbox Linux page
The Xbox is a legacy-free PC by Microsoft that consists of an Intel Celeron 733 MHz CPU, an nVidia GeForce 3MX, 64 MB of RAM, a 8/10 GB hard disk, a DVD drive and 10/100 Ethernet. As on every PC, you can run Linux on it.
64 Mb RAM doesn't sound overly generous.
(The Xbox Linux web site appears to be dead.)
Meanwhile the Oolite home site
Originally written for Mac OS X, ... Oolite is available for Mac OS X (10.3.9 and higher) and PCs running Windows XP, Windows Vista or Linux. It requires at least a 400 MHz processor, 256 MiB of memory, and a graphics card capable of accelerating OpenGL graphics.
Commander Skellybones says:
"Game over, man. Game over."