The Core 2 Quad Q9xxx series will be the fastest of all the CPUs you've listed as potential upgrades.
The Q9xxx just refers to the model range. For example, I had a Core 2 Quad Q9400 CPU. It's a very good CPU, and was not particularly expensive. There are more powerful ones available with model names like Q9450, Q9550, Q9650, etc. You just need to shop around.
__________________
Pro Tools 9/10/11, Reaper x64, Adobe Audition, SoundTrack Pro, Mixxx
Dual Xeon 2620, 32gb, 240GB Intel SSD & Apple MacBook Pro, 16gb, 750gb HDD
M-Audio ProFire 2626 + Art TubeOpto 8 with Ei 12AX7 Smooth Plate tube swap
|