This CHUD allows me to use a new "nap' mode, switch from dual to single cpu, turn off their caches etc..
While in idle and single cpu mode I got 15 degrees cooler, this is very important to me while my mac sits on idle or renders certain plugs in LW that arent SMPT aware. I get to have a dual MMD thats as quiet as a G3.
Back up work
make sure your mac is MMD or G5
One freeze up over the last 3 hrs of it on, I was switching back and forward from single to dual constantly so i deserved it.
"nap" mode Im unaware if it slows down the mac, cant notice any.
Use an OSX temperature monitor app to test your findings.
Im sure this app was speciafically made with xserve in mind. Very useful indeed.
Now if only we could have a "dream" mode that switches off almost everything in your mac while rendering to keep it cool in its dream sleep.