Noticed while preparing my system to 18 box that some cores where set to parking and even with 18 boxes loaded that didn't became active and the system was lagging so decided to research a bit and found out that with a registry tweak you can permanently activate it and that the side effect is that the system will only uses a bit more power.
http://allisterb.blogspot.com/2013/01/the-saga-of-muticore-cpus-core-parking.html
Little prog to check if your cores are parked and option to unpark/park em without editing the registry yourself
http://www.coderbag.com/Programming-C/Disable-CPU-Core-Parking-Utility
Will need to restart the computer after you did changes with the prog.
Hope it will help some ppl out here.