- Install the software provided by PowerLogix
- Type in sudo plxcache -off in the Terminal
- Type in sudo plxcache -r 3.5 where 3.5 is the ratio controlling the cache speed in regard to the bus speed (3.5 gives you 229 MHz cache in a 100 MHz system bus, etc)
- Experiment until you can achieve the highest speed with stability
do shell script "plxcache -off" password ¬Save it as run-only and put it into your login items. This works for Sonnet and PowerLogix chips alike.
"ADMIN PASSWORD" with administrator privileges
do shell script "plxcache -r 3.5" password ¬
"ADMIN PASSWORD" with administrator privileges
[Editor's note: I don't have a G4 upgrade card to test this with ... insert standard "backup before experimenting" advice here!]

