Minimum Requirements and Supported Platforms

Memory. The minimum memory requirement for Indy, R4000 Indigo and Indigo2 is 32 megabytes (MB). However, 64MB of memory or more is highly recommended. For all other supported systems, the minimum is 64MB.
Disk Space. A standard, default installation of IRIX 6.5 plus IRIX 6.5.18m occupies approximately 1.5 gigabytes (GB) of disk space.
A 2GB or larger hard drive is recommended, although it is possible to limit your installations so that you can run 6.5 on less than 1GB, as shown in the example below.

Example of a "Minimal IRIX" Upgrade
What follows is an example of how you could install a very minimal IRIX 6.5.18 on less than 1GB--by substituting these installation commands for the installation selection part of the IRIX upgrade. This "minimal IRIX" example occupies about 500MB on an Indy, and does not include any of the online books or man pages.
Inst> keep *

Inst> install required

Inst> install default eoe 4Dwm desktop_base x_eoe desktop_eoe netscape

Inst> keep *.books *.man

Inst> install prereqs

You can upgrade from IRIX 5.3, or IRIX 6.2 through 6.5.15.

IRIX 6.5.18 supports all SGI systems with R4x00, R5x00, R8000, and R1x000 CPU types, except Crimson. This includes:

The following are not supported in 6.5.18: