When the "Intel® Core™2 Quad Processor" will come for iMacs 20-inch / 24-inch ?

When the "Intel® Core™2 Quad Processor" will come for iMacs 20-inch / 24-inch ?

May order a PC APPLE iMac desktop with power 240V or 240V/110V(both), if I buy from a USA Store ?
I have usa address ?

Not to sure on your first westion, but to answer your send question, all Mac come with 240/110V. All Mac will sweet what voltage is coming in and switch automaticly.

I mean When the "Intel® Core™2 Quad Processor" will come installed in the iMacs 20-inch / 24-inch ?

is it already came or...

Unlikely to happen. Quad cores tend to appear in the Mac Pros, and they could be seeing Corei7 next month.

We'll see them when Apple decides to put them in the iMacs. Nobody knows for sure if or when this will happen.