Netbook Question: Am I losing my marbles?

I have a Lenovo S10 Series IdeaPad Netbook (or ultra-portable notebook). I LOVE it. It is vastly superior to Asus' eePC offering, Acer's machine, MSI's product, and pretty much anything else in its category. Strangely enough, it gets very little attention in the media compared to the aforementioned machines.

That said, at the $400 pricepoint, all the machines have very similar specs (assuming a non solid-state HD): About 120gb for the HD, 512mb/1gb (though I upgraded to 2 gb) of RAM,an intel chipset, and an Intel Atom processor, probably running at 1.6 GHz.

Now, the technical specs for this machine, and all the others I mentioned, indicate that the processor is a single core Intel Atom. I know Intel released a dual core Atom several months after the single core's introduction.

Yet, my OS (which is Fedora Linux -- I wiped out Windows XP) seems convinced I have 2 cores. An included diagnostic even shows differing loads on each alleged core. But Lenovo assures me this is a single core product.

What is going on? Any ideas? Thanks as always!