As it turns out, it runs a quad-core version of AMD's new Temash chip, which is being billed as the first quad-core, x86-based SoC. (There's also a dual-core version.) Built into the chip is an HD Radeon 8000 series GPU with AMD's Graphics Core Next architecture, so in theory you should be able to pull off PC-caliber gaming even on a tablet.
The latest dual-core ARM Cortex A9 CPUs due to arrive in tablets this year should pull ahead of Atom even more, especially when bolstered by powerful graphics such as Nvidia.