Linux on an old computer???

Been trying some other live distos of linux recently openSuse and Mandravia.

These were tried on an old Dell Pentium 3, 256MB RAM Mandravia ran very slow but on a faster machine it would be quite impressive. OpenSuse seemed to have font issues.
At present I still have Xubuntu on my Linux box. I added an additional 256MB of memory,
bringing the total memory up to a whopping 512MB RAM.

I saw this new Distro called Mint. The hardware requirements say if you have more than 512MB memory then you should try it.