LCBoliou,
The core i7s are quad core cpus with multi threading (= 8 'cpus' in the task manager performance view) and Vista 64bit Premium sees all 8 threads. Most of the reviews of the core i7s I have seen have been run on Vista Premium 64 bit.
As it happens I am running Vista Business 64 bit but I think Premium 64 bit handles the core i7 the same.

[url=http://holocrash.smackjeeves.com][img]http://img1.smackjeeves.com/images/uploaded/banners/8/6/86a8be6572n9H.jpg[/img][/url]