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That was my idea too, but then I visited steinberg official site today.
They recommend to turn the HT off due to problems for the time being whilst they investigate, the issue is not with cubase however but with third party plugins. That means I would only have 2.6ghz to make use of. I've also found out many vsti do not like 64 bit. It's all going down hill now. lol
It all depends of what plugins you use.
Four years ago i was using a P4 3.06ghz HT with Cubase and had no issues with plugins causing errors with HT. At work we have had no issues running Cubase 5 and the i7.
Wouldn't put me off an i7!