The purpose of this software is to provide a means with which to enable and configure the backside L2 cache using Mac OS X for computers with G3 or G4 upgrade cards. Installation and configuration of this software requires several steps, so read these release notes carefully
L2CacheConfig 3.3 works with Mac OS X 10.1 and 10.2. I think it probably works with Mac OS X 10.0 as well, but I have not tested it. Let me know if you try.