ianmak2003 wrote: > logic audio pc does not seem to work with this prosssesor > is there any known issues keeps blue screening also using uniter8 Which version of Logic? Which Windows operating system? The last version (5.5.1) runs in multi-processor environments, but isn't optimized for them. It certainly works with dual processors. You could try changing the 'Processor Affinity' settings for Logic in 'TaskManager/Processes' to run on just one core anyway. There's a utility or two somewhere that will automate this (---Google). Unless you've just upgraded only the CPU in an otherwise functioning PC it ain't necessarily the quad-core giving you the blue screens... ___ aDE