Bay Trail Atom system-on-a-chip processors are quad-core.
Intel has announced new Bay Trail Atom processors for tablets, as well as the 'Lexington' processor for smartphones.
The new Bay Trail Atom system-on-a-chip processors are quad-core and are notably smaller than previous Atoms thanks to a new 22nm design. They boast better "all-day" battery life and greater processing power, which is apparently twice as fast as current Atoms. Quad-core Bay Trail Atoms is currently scheduled for a launch by holiday 2013.
For worldwide markets and budget phones, Intel announced the development of another Atom processor, the 'Lexington'. Intel also announced a smartphone for emerging markets that will sport the Lexington Atom Z2420 w/XMM 6265 chip. The chips are designed for markets including Africa, China, Latin America and Southeast Asia.
The chips boasts speeds of up to 1.2GHz with Hyper-Threading, HD video encoding and decoding (1080p 30fps), camera support with seven-frame burst mode, as well as SGX540 graphics. FM radio, microSD card slot and Intel Wireless Display for playback on TVs are also included.
In other words, they are using the same GPU as my old now defunct Galaxy S.
Intel is still a relatively new player in the SoC market. The first generations of Atoms were not particularly successful but Intel is getting pretty serious about it. The newest Atoms manage to beat some of the newest ARM chips in many benchmarks on both power and performance. I wasn't expecting that considering how much legacy crud x86 CPUs have to waste power on.
Seems like Intel already has some quite decent SoCs, albeit possibly not for 3D mobile gaming.
bay trail is a tablet solution (update to the currently shipping clovertrail), not a phone solution, so not sure why you bought medfield in to this... It has full x86 functionality... (although don't bother trying to run anything needing any real power...)