Too be honest, i would not even bother overclocking.
a. its a laptop, worse yet, its a netbook.
b. i doubt you could overclock in the BIOS as it would be locked down by the manufacturer.
c. The temp would be very high to the point it will begin to cause issues.
d. Don't use software, it can cause issues with instability.
The best thing to do, is get a desktop.
Also, how are you 'extreme' gaming? its only Intel GMA graphics, surely you must be stuttering like hell, unless you are gaming with old, and i mean old games.
Sorry to say all this, but laptops and netbooks are not the best things to oc, regardless of who made it.
And on another note, i think you would hit issue overclocking an Atom as its a soldered CPU that is pretty restricted to OC.
But... If you want to overclock then don't expect it to be 100% stable, if you can oveclock it at all.