What software are using? When does it hit 100%? Transcoding?
My first thought would be a quad-core i5 and a Z77motherboard. What other specs is the machine? RAM etc?
I'm using Cubase SX.
it hits 100% when applying effects plug ins. the track then struggles to play consitently. i check the VST performance and can see the CPU at virtually 100%.
I've got 3.0 gig DDR2 RAM
1 x 2T hard rive
1 x 500G hard drive