Ok, I found it on the FC6DVD "RELEASE-NOTES-en_US.html#id329169":
18.104.22.168. Processor and Memory Requirements
The following CPU specifications are stated in terms of Intel processors. Other processors, such as those from AMD, Cyrix, and VIA that are compatible with and equivalent to the following Intel processors, may also be used with Fedora Core.
Fedora Core 6 requires an Intel Pentium or better processor, and is optimized for Pentium 4 and later processors.
Recommended for text-mode: 200 MHz Pentium-class or better
Recommended for graphical: 400 MHz Pentium II or better
Minimum RAM for text-mode: 128MiB
Minimum RAM for graphical: 192MiB
Recommended RAM for graphical: 256MiB
22.214.171.124. Hard Disk Space Requirements
The disk space requirements listed below represent the disk space taken up by Fedora Core 6 after the installation is complete. However, additional disk space is required during the installation to support the installation environment. This additional disk space corresponds to the size of /Fedora/base/stage2.img on Installation Disc 1 plus the size of the files in /var/lib/rpm on the installed system.
In practical terms, additional space requirements may range from as little as 90 MiB for a minimal installation to as much as an additional 175 MiB for an installation that includes nearly all the packages. The complete installed packages can occupy over 9 GB of disk space.
Additional space is also required for any user data, and at least 5% free space should be maintained for proper system operation.
Unix is user friendly. However, it isn't idiot friendly.