Hello,
I have Cubase SX 2.2.0 Build 35 working on:

Asus P4P800 SE
Intel Pentium 4 3000 Hyper Threading with 1 MB Cache (Prescott)
with a CPU Temperature about 48C / 118F
Kingston 512MB DDR ECC -> error correction

With the Hyper Threading ON, i have problems on Cubase like:

some Tracks dont play
Computer freezes when I'm working on cubase

i would like to know if there are more people with this errors