Hello bob800,
The current status is this
Information about using Cubase 4 and Nuendo 4 with 8-core systems :: Knowledge Base :: Steinberg Media Technologies GmbH
Things will hopefully change in the near future regarding this. Please notice that Hypertreading with the new I7 CPU's is also something were we are working on. Hopefully we can combine this all together with an update.
Cheers,
Chris