Interesting through I found the upgrade to run the hottest of all four upgrades. I found this to be especially useful as I had difficulty running the processor at a 50 MHz bus setting. The upgrade uses the company's G4 Cache Profiler to control the board's settings. Powerlogix also include a specialized AltiVec Enabler extension, designed to assist in G4 accelerated code. Like the Newer upgrade, Sonnet offers no configuration controls.
Some customers prefer to tweak their upgrades for best performance or reliability.
On the other hand, for those who don't want to think about dip switches, the Sonnet upgrade keeps installation simple. The Sonnet upgrade worked well and included ample documentation. The upgrade ships with the company's Crescendo software, G4 enabler and Metronome utility software. The XLR8 package is made up of a daughter-type upgrade that has a removable ZIF socket and a 400 MHz ZIF processor. Assembled, the upgrade operates identically to the other upgrades.