Im trying to use Logic Express on a P4 2,6 (SSE2). The thing is that whenever I insert an FX the program crashes with a message refering to the audio engine not being able to handle the process in time. I've tryed with the onboard audio and with an M-audio omnistudio USB interface, different latencies....but not a go. The project im trying showldnt be very demanding; its only 3 tracks.....
I wonder if this has to do with the SSE2 emulation.... I might update the cpu if Im certain that it would solve the issue....
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Logic is supposed to use a lot of SSE3 optimizations, and SSE2 emulation is not perfect. So you´ll get either crashes or very high cpu usages.

I have both, SSE2 and SSE3 computers and the perfomance and stability difference is huge.

VooD, tnx for the answer....
I'll see what can I get for upgrade.....
Do you experiment any crashes in your sse3 system (logic related)?, what graphic card do U use?
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In my setup works fine. I´m using a 7600GT. Full QE&CI support.