Do I need cache control software for an upgraded G4?

ElDiabloConCaca

U.S.D.A. Prime
I have a question -- I have a G4/400 PCI machine that I've been thinking about upgrading. I've found a G4/500 ZIF module for about $325, and from what I've heard, going from 400 to 500 makes quite a difference in performance.

Do I need cache control software for this upgrade? *WHY* do I need cache control software -- isn't the cache on the chip (or on the ZIF module)? Why would the cache be DISabled on one of these chips? Do I need separate software for both OS 9 and OS X, since I still use both equally? How bad will the performance suck with a DISabled cache?
 
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