All of the recent Atom brand chips for mobile deployment are SoCs. There's a CPU, a GPU and a shared memory package on the same silicone. Intel calls it a SoC themselves [1]

[1]: http://newsroom.intel.com/community/intel_newsroom/blog/2012...

     Onstage was the world’s first public demonstration of the forthcoming 32nm Intel Atom SoC for tablets and hybrids running on Microsoft* Windows* 8, codenamed “Clover Trail.”